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All questions of Cell - The Unit of Life for NEET Exam
Which one of the following cell organelles is enclosed by a single membrane ? [2016]- a)Mitochondria
- b)Chloroplasts
- c)Lysosomes
- d)Nuclei
Correct answer is option 'C'. Can you explain this answer?
Which one of the following cell organelles is enclosed by a single membrane ? [2016]
a)
Mitochondria
b)
Chloroplasts
c)
Lysosomes
d)
Nuclei
|
Sushant Goyal answered |
(c) Double Membrane bound Organelles: Mitochondria, Chloroplasts, Endoplasmic Reticulum, Golgi Body, and Nucleus. Single Membrane bound Organelles: Lysosomes, Peroxisomes, and Vacuoles. Organelles lacking any membrane: Ribosomes, Centrioles, Nucleolus.
Cell organelles with single membrane is- a)Lysosomes
- b)Chloroplast
- c)Plastids
- d)Mitochondria
Correct answer is option 'A'. Can you explain this answer?
Cell organelles with single membrane is
a)
Lysosomes
b)
Chloroplast
c)
Plastids
d)
Mitochondria
|
Ishaan Menon answered |
Lysosomes are single membrane structures containing enzymes for digestion of all types of macromolecules.
Which is common in plant and animal cells- a)Mitochondria
- b)Plastids
- c)Centrioles
- d)Central vacuoles
Correct answer is option 'A'. Can you explain this answer?
Which is common in plant and animal cells
a)
Mitochondria
b)
Plastids
c)
Centrioles
d)
Central vacuoles
|
Ashwini Khanna answered |
Mitochondria are present in both plant as well as animal cells. Plastids and central vacuoles are present in plant cells and centrioles are present in only animal cells.
The process of movement of few ions or molecules across the membrane against a concentration gradient from lower to higher concentration, it is called
a) Diffusionb)Passive transportc)Active transportd) OsmosisCorrect answer is option 'C'. Can you explain this answer?
|
Vijay Bansal answered |
Passive transport, also known as passive diffusion, is a process by which an ion or molecule passes through a cell wall via a concentration gradient, or from an area of high concentration to an area of low concentration. It’s like moving from the train to the platform of a subway station, or stepping out of a crowded room. Basically, passive transport gives an ion or molecule “room to breathe.”
Which structures perform the function of mitochondria in bacteria? [2014]- a)Nucleoid
- b)Ribosomes
- c)Cell wall
- d)Mesosomes
Correct answer is option 'D'. Can you explain this answer?
Which structures perform the function of mitochondria in bacteria? [2014]
a)
Nucleoid
b)
Ribosomes
c)
Cell wall
d)
Mesosomes
|
Ayush Sengupta answered |
(d) In some bacteria (e.g., Bacillus subtilis) the plasma membrane form certain invaginations or in foldings called mesosomes in the cytoplasm. The mesosomes have various functions, viz., respiratory, secretory etc.
Which of the following are not membranebound? [2015 RS]- a)Ribosomes
- b)Lysosomes
- c)Mesosomes
- d)Vacuoles
Correct answer is option 'A'. Can you explain this answer?
Which of the following are not membranebound? [2015 RS]
a)
Ribosomes
b)
Lysosomes
c)
Mesosomes
d)
Vacuoles
|
Mrinalini Bajaj answered |
(a) Ribosomes are not membrance-bound cell organelle.
Who was the first to explain that cells divide?
- a)Schwann
- b)Robert Brown
- c)Rudolf Virchow
- d)Anton von LeeuwenHoek
Correct answer is option 'C'. Can you explain this answer?
Who was the first to explain that cells divide?
a)
Schwann
b)
Robert Brown
c)
Rudolf Virchow
d)
Anton von LeeuwenHoek
|
Mahesh Saini answered |
Rudolf Virchow(1855) first explained that cells divided and new cells are formed .
Read the given statements and select the correct option.
Statement 1: The cisternae in Golgi complex have cis face and trans face.
Statement 2: The cis face is also called forming face and trans face is also called maturing face.- a)Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
- b)Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
- c)Statement 1 is correct and statement 2 is incorrect.
- d)Both statements 1 and 2 are incorrect.
Correct answer is option 'B'. Can you explain this answer?
Read the given statements and select the correct option.
Statement 1: The cisternae in Golgi complex have cis face and trans face.
Statement 2: The cis face is also called forming face and trans face is also called maturing face.
Statement 1: The cisternae in Golgi complex have cis face and trans face.
Statement 2: The cis face is also called forming face and trans face is also called maturing face.
a)
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
b)
Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
c)
Statement 1 is correct and statement 2 is incorrect.
d)
Both statements 1 and 2 are incorrect.
|
Mayank Gupta answered |
Explanation:
Statement 1: The cisternae in Golgi complex have cis face and trans face.
The Golgi complex is an organelle found in eukaryotic cells that plays a key role in the processing and sorting of proteins and lipids. It consists of a series of flattened membrane-bound sacs called cisternae. These cisternae have two distinct faces - the cis face and the trans face.
Statement 2: The cis face is also called the forming face and the trans face is also called the maturing face.
The cis face of the Golgi complex is the side that is closest to the endoplasmic reticulum (ER), where newly synthesized proteins and lipids enter the Golgi. It is involved in receiving and sorting proteins and lipids from the ER. The cis face is also referred to as the forming face because it is where the Golgi complex receives and forms vesicles containing these proteins and lipids.
The trans face of the Golgi complex is the side that is farthest from the ER. It is involved in packaging proteins and lipids into vesicles that will be transported to their final destinations. The trans face is also referred to as the maturing face because it is where the Golgi complex modifies and matures these proteins and lipids before they are packaged into vesicles.
Conclusion:
Both statements 1 and 2 are correct, but statement 2 is not the correct explanation of statement 1. The cis face and trans face of the Golgi complex are indeed referred to as the forming face and maturing face, respectively, but these terms do not explain the function or location of the two faces. The cis face is where the Golgi complex receives and forms vesicles, while the trans face is where it packages and matures proteins and lipids. Therefore, the correct option is B.
Statement 1: The cisternae in Golgi complex have cis face and trans face.
The Golgi complex is an organelle found in eukaryotic cells that plays a key role in the processing and sorting of proteins and lipids. It consists of a series of flattened membrane-bound sacs called cisternae. These cisternae have two distinct faces - the cis face and the trans face.
Statement 2: The cis face is also called the forming face and the trans face is also called the maturing face.
The cis face of the Golgi complex is the side that is closest to the endoplasmic reticulum (ER), where newly synthesized proteins and lipids enter the Golgi. It is involved in receiving and sorting proteins and lipids from the ER. The cis face is also referred to as the forming face because it is where the Golgi complex receives and forms vesicles containing these proteins and lipids.
The trans face of the Golgi complex is the side that is farthest from the ER. It is involved in packaging proteins and lipids into vesicles that will be transported to their final destinations. The trans face is also referred to as the maturing face because it is where the Golgi complex modifies and matures these proteins and lipids before they are packaged into vesicles.
Conclusion:
Both statements 1 and 2 are correct, but statement 2 is not the correct explanation of statement 1. The cis face and trans face of the Golgi complex are indeed referred to as the forming face and maturing face, respectively, but these terms do not explain the function or location of the two faces. The cis face is where the Golgi complex receives and forms vesicles, while the trans face is where it packages and matures proteins and lipids. Therefore, the correct option is B.
Select the correct matching in the following pairs: [2015 RS]- a)Smooth ER – Synthesis of lipids
- b)Rough ER – Synthesis of glycogen
- c)Rough ER – Oxidation of fatty acids
- d)Smooth ER – Oxidation of phospholipids
Correct answer is option 'A'. Can you explain this answer?
Select the correct matching in the following pairs: [2015 RS]
a)
Smooth ER – Synthesis of lipids
b)
Rough ER – Synthesis of glycogen
c)
Rough ER – Oxidation of fatty acids
d)
Smooth ER – Oxidation of phospholipids
|
Pallabi Reddy answered |
(a) Lipid synthesis takes place in smooth endoplasmic reticulum.
Smallest free living organism are- a)PPLOs
- b)Bacteria
- c)Viroids
- d)Virus
Correct answer is option 'A'. Can you explain this answer?
Smallest free living organism are
a)
PPLOs
b)
Bacteria
c)
Viroids
d)
Virus
|
Shounak Nair answered |
PleuroPneumonia Like Organisms (PPLOs) are considered as smallest free living organism. It do not contain cell membrane or cell wall and present as fluid. It causes disease in plants.
Cellular organelles with membranes are : [2015 RS]- a)chormosomes, ribosomes and endoplasmic reticulum
- b)endoplasmic reticulum, ribosomes and nuclei
- c)lysosomes, Golgi apparatus and mitochondria
- d)nuclei, ribosomes and mitochondria
Correct answer is option 'C'. Can you explain this answer?
Cellular organelles with membranes are : [2015 RS]
a)
chormosomes, ribosomes and endoplasmic reticulum
b)
endoplasmic reticulum, ribosomes and nuclei
c)
lysosomes, Golgi apparatus and mitochondria
d)
nuclei, ribosomes and mitochondria
|
Sonal Kulkarni answered |
(c) Lysosomes, golgi apparatus and mitochondria are the cell organelles which have membranes.
The chlorophyll pigment is readily soluble in:-- a)Water
- b)Acids
- c)Alkalies
- d)Acetone
Correct answer is option 'D'. Can you explain this answer?
The chlorophyll pigment is readily soluble in:-
a)
Water
b)
Acids
c)
Alkalies
d)
Acetone
|
|
Rajesh Gupta answered |
The chlorophyll pigment is readily soluble in acetone. Chlorophylls possess a phytyl chain which is bound to a porphyrin ring system. The possession of the phytyl side chain, which is esterified to the carboxyl group of the ring, gives the chlorophylls their lipid character. Moreover, chlorophylls are fat-soluble compounds that can be extracted from water-containing living plant tissue by organic solvents such as acetone, methanol, or ethanol, which can take up water.
When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as: (2021)- a)Sub-metacentric
- b)Acrocentric
- c)Metacentric
- d)Telocentric
Correct answer is option 'C'. Can you explain this answer?
When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as: (2021)
a)
Sub-metacentric
b)
Acrocentric
c)
Metacentric
d)
Telocentric
|
Mira Joshi answered |
The metacentric chromosome has middle centromere forming two equal arms of the chromosome.
Rough E.R. mainly responsible for:-- a)Protein synthesis
- b)Cell wall formation
- c)Lipid synthesis
- d)Cholesterol synthesis
Correct answer is option 'A'. Can you explain this answer?
Rough E.R. mainly responsible for:-
a)
Protein synthesis
b)
Cell wall formation
c)
Lipid synthesis
d)
Cholesterol synthesis
|
Neha Joshi answered |
Rough endoplasmic reticulum carry ribosomes on their surface. The ribosomes present on rough endoplasmic reticulum synthesize secretory proteins. The proteins required for internal use of cell are synthesized on cytoplasmic ribosomes.
A single unit membrane surrounds the organelle:- a)Chloroplast
- b)Nucleus
- c)Lysosome
- d)Microsome
Correct answer is option 'C'. Can you explain this answer?
A single unit membrane surrounds the organelle:
a)
Chloroplast
b)
Nucleus
c)
Lysosome
d)
Microsome
|
Pooja Mehta answered |
Single membrane-bound: Some organelles are bounded by a single membrane. For example, vacuole, lysosome, Golgi Apparatus, Endoplasmic Reticulum etc. They are present only in a eukaryotic cell.
The rod shaped bacteria is called as- a)Bacillus
- b)Vibrio
- c)Spiral
- d)Spherical
Correct answer is option 'A'. Can you explain this answer?
The rod shaped bacteria is called as
a)
Bacillus
b)
Vibrio
c)
Spiral
d)
Spherical
|
Dipanjan Chawla answered |
The shapes of bacteria are bacillus (rod like), coccus (spherical), vibrio (comma shaped) and spirillum (spiral).
The structure of plasma membrane fluid mosaic model is proposed by- a)Gram
- b)Singer and Nicolson
- c)Schwann and Schleiden
- d)Robert brown
Correct answer is option 'B'. Can you explain this answer?
The structure of plasma membrane fluid mosaic model is proposed by
a)
Gram
b)
Singer and Nicolson
c)
Schwann and Schleiden
d)
Robert brown
|
|
Rajeev Saxena answered |
An improved model of the structure of cell membrane was proposed by S.J. Singer and G.L. Nicolson (1972) widely accepted as fluid mosaic model.CORRECT OPTION IS B.
Who first saw and described a live cell?- a)T. Schwann
- b)R. Virchow
- c)A.V. Leeuwenhoek
- d)M. Schleiden
Correct answer is option 'C'. Can you explain this answer?
Who first saw and described a live cell?
a)
T. Schwann
b)
R. Virchow
c)
A.V. Leeuwenhoek
d)
M. Schleiden
|
Deepak Joshi answered |
Anton Von Leeuwenhoek first saw and described a live cell.
Chlorophyll in chloroplasts is located in- a)Pyrenoid
- b)Both grana and stroma
- c)Grana
- d)Stroma
Correct answer is option 'C'. Can you explain this answer?
Chlorophyll in chloroplasts is located in
a)
Pyrenoid
b)
Both grana and stroma
c)
Grana
d)
Stroma
|
|
Raghav Bansal answered |
Correct Answer :- c
Explanation : Chloroplasts are structurally made up of two components- thylakoids (internal membrane structures) and stroma. Some of the thylakoid membranes are stacked one above the other and are called as grana. The grana contain light trapping pigment chlorophyll and are thus the site of light reaction.
Carbohydrates, the most abundant biomolecules on Earth, are produced by- a)Viruses, fungi and bacteria
- b)Fungi, algae and green plant cells
- c)Some bacteria, algae and green plant cells
- d)All bacteria, fungi and algae
Correct answer is option 'C'. Can you explain this answer?
Carbohydrates, the most abundant biomolecules on Earth, are produced by
a)
Viruses, fungi and bacteria
b)
Fungi, algae and green plant cells
c)
Some bacteria, algae and green plant cells
d)
All bacteria, fungi and algae
|
Rocky Handsome answered |
Carbohydrates are organic compounds synthesized in the chlorophyll containing cells of some bacteria,-algae and green plant cells, during photosynthesis. Certain photoautotrophic bacteria eg. Green sulphur bacteria and purple sulphur bacteria contain pigments like chlorobium chlorophyll and bacteriochlorophyll respectively that helps them in photosynthesis. During photosynthesis carbon dioxide is reduced into carbohydrates by water and oxygen is liberated.
so option C ) is correct
( . __ .)
Lysosomes are produced by- a)Leucoplast
- b)Golgi bodies
- c)Mitochondria
- d)Endoplasmic reticulum
Correct answer is option 'B'. Can you explain this answer?
Lysosomes are produced by
a)
Leucoplast
b)
Golgi bodies
c)
Mitochondria
d)
Endoplasmic reticulum
|
Rohan Unni answered |
These are membrane bound vesicular structures formed by the process of packaging in the Golgi apparatus.
Which of the following cell organelles store hydrolytic enzymes?- a)Chloroplasts
- b)Centrioles
- c)Chromoplasts
- d)Lysosomes
Correct answer is option 'D'. Can you explain this answer?
Which of the following cell organelles store hydrolytic enzymes?
a)
Chloroplasts
b)
Centrioles
c)
Chromoplasts
d)
Lysosomes
|
|
Hitakshi Tamta G answered |
Lysosomes are spherical bodies, or vacuoles that are enclosed by a single membrane (membrane- bound organelles). It contains different hydrolytic enzymes, such as proteases, lipases, and nucleases that are capable of breaking down all types of biological polymers (e.g., proteins, nucleic acids, carbohydrates, and lipids) that enter the cell or are no longer useful to the cell. So, the correct answer is 'Lysosome'.
The organelle involved in respiration is- a)Mitochondria
- b)Endoplasmic reticulum
- c)Chloroplast
- d)Golgi complex
Correct answer is option 'A'. Can you explain this answer?
The organelle involved in respiration is
a)
Mitochondria
b)
Endoplasmic reticulum
c)
Chloroplast
d)
Golgi complex
|
Akshat Chavan answered |
Mitochondria are the sites of aerobic respiration. They producecellular energy in the form of ATP
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as: [2014]- a)Microtubules
- b)Microfilaments
- c)Intermediate filaments
- d)Lamins
Correct answer is option 'B'. Can you explain this answer?
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as: [2014]
a)
Microtubules
b)
Microfilaments
c)
Intermediate filaments
d)
Lamins
|
Arnab Iyer answered |
(b) Microtubule, microfilament and intermediate filaments along with ER form cytoskeleton. Microfilaments are nonliving, solid and consist of actin protein. They are 4-6 nm in diameter.
Chlorophyll is located inside- a)Stroma
- b)Plasma lemma
- c)Chromatophores
- d)Thylakoids
Correct answer is option 'D'. Can you explain this answer?
Chlorophyll is located inside
a)
Stroma
b)
Plasma lemma
c)
Chromatophores
d)
Thylakoids
|
|
Mrinalini Bajaj answered |
The chloroplast consists of a number of organised flattened membranous sacs called the thylakoids,Chlorophyll pigments are present in the thylakoids.
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells? (2020)- a)Golgi bodies
- b)Polysomes
- c)Endoplasmic reticulum
- d)Peroxisomes
Correct answer is option 'A'. Can you explain this answer?
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells? (2020)
a)
Golgi bodies
b)
Polysomes
c)
Endoplasmic reticulum
d)
Peroxisomes
|
|
Mira Joshi answered |
Proteins and lipids are formed in the endoplasmic reticulum and some of them are modified to form glycoproteins and glycolipids in the Golgi apparatus.
In prokaryotes, the reserved food material is stored in- a)Cytoplasm
- b)Vacuole
- c)Centrosome
- d)Endoplasmic reticulum
Correct answer is option 'A'. Can you explain this answer?
In prokaryotes, the reserved food material is stored in
a)
Cytoplasm
b)
Vacuole
c)
Centrosome
d)
Endoplasmic reticulum
|
Rajat Roy answered |
Reserve material in prokaryotic cells are stored in the cytoplasm in the form of inclusion bodies.
The osmotic expansion of a cell kept in water is chiefly regulated by: [2014]- a)Mitochondria
- b)Vacuoles
- c)Plastids
- d)Ribosomes
Correct answer is option 'B'. Can you explain this answer?
The osmotic expansion of a cell kept in water is chiefly regulated by: [2014]
a)
Mitochondria
b)
Vacuoles
c)
Plastids
d)
Ribosomes
|
Nilanjan Chakraborty answered |
(b) The vacuole is bound by a single membrane called tonoplast. It also functions as semipermeable membrane. It segregates vacuolar contents from cytoplasm, allows osmotic entry or exit of water, concentration and storage of nutrients as well as wastes.
Cytoskeleton is made of- a)Phosphoglycerides
- b)Micro tubules
- c)Proteinaceousfilaments
- d)Hemicellulose
Correct answer is option 'C'. Can you explain this answer?
Cytoskeleton is made of
a)
Phosphoglycerides
b)
Micro tubules
c)
Proteinaceousfilaments
d)
Hemicellulose
|
|
Rajeev Saxena answered |
Proteinaceous filaments
The cytoplasm of all eukaryotic cells is crisscrossed by a network of protein fibres that support the shape of the cell and anchor organelles to fixed locations. It is a dynamic system with three types of fibres-actin filaments, microtubule and intermediate filaments.
Which one of the following has its own DNA?- a)Mitochondria
- b)Dictyosome
- c)Lysosome
- d)Peroxisome
Correct answer is option 'A'. Can you explain this answer?
Which one of the following has its own DNA?
a)
Mitochondria
b)
Dictyosome
c)
Lysosome
d)
Peroxisome
|
Gaurav Kumar answered |
In mitochondria, the inner membrane space is filled with a matrix which contains dense granules along with ribosomes and mitochondrial DNA. The mitochondrial DNA is circular in nature. There number varies from 2-6. Besides DNA, a mitochondrion has RNA and its ribosomes also. Thus, a complete protein synthesizing machinery is present in mitochondria, which suggests the semi-autonomous nature of mitochondria. Dictyosome, lysosome and peroxisome do not have their own DNA.
Chromatin is made up of :–- a)Nucleoprotein
- b)Nucleoside
- c)Pentose sugar
- d)Nitrogenous base
Correct answer is option 'A'. Can you explain this answer?
Chromatin is made up of :–
a)
Nucleoprotein
b)
Nucleoside
c)
Pentose sugar
d)
Nitrogenous base
|
|
Satakshi Kumari answered |
In eukaryotes , there is a set of positively charged , basic proteins called history. Histones are organized to form a unit of eight molecules called Histones octamer. The negativity charged, DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome . Nucleosome constitute the repeating unit of a structure in nucleus called chromatin.
How much percent of vacuoles occupy the volume of the cell in plant cells?- a)80%
- b)90%
- c)50%
- d)70%
Correct answer is option 'B'. Can you explain this answer?
How much percent of vacuoles occupy the volume of the cell in plant cells?
a)
80%
b)
90%
c)
50%
d)
70%
|
Arya Nair answered |
In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell.
Elaioplasts belongs to- a)Chloroplast
- b)Leucoplast
- c)Amyloplast
- d)Chromoplast
Correct answer is option 'B'. Can you explain this answer?
Elaioplasts belongs to
a)
Chloroplast
b)
Leucoplast
c)
Amyloplast
d)
Chromoplast
|
Arpita Tiwari answered |
The leucoplasts are the colourless plastids of varied shapes and sizes with stored nutrients. Leucoplast includes: a) Amyloplasts storing carbohydrates. b) Elaioplastsstoring oils and fats and c) Aleuroplasts storing proteins.
The core metal of chlorophyll is- a)Mg
- b)Fe
- c)Ni
- d)Cu
Correct answer is option 'A'. Can you explain this answer?
The core metal of chlorophyll is
a)
Mg
b)
Fe
c)
Ni
d)
Cu
|
Ritika Khanna answered |
It is consisted of a porphyrin head and a phytol tail. Porphyrin is a cyclic tetrapyrol structure, having a magnesium atom in the centre. Chlorophyll a methyl group (CH3) is attached to the third carbon in the porphyrin head.
Animal cell do not possess- a)Centriole
- b)Plamsodesmata
- c)Ribosomes
- d)Plasmalemma
Correct answer is option 'B'. Can you explain this answer?
Animal cell do not possess
a)
Centriole
b)
Plamsodesmata
c)
Ribosomes
d)
Plasmalemma
|
Prisha Singh answered |
Animal cell do not possess plasmodesmata but it contain ribosomes, centriole andplamalemma. Plasmodesmata is the connection between two plant cells.
Many cells function properly and divide mitotically even though they do not have- a)Plasma membrane
- b)Cytoskeleton
- c)Plastids
- d)Mitochondria
Correct answer is option 'C'. Can you explain this answer?
Many cells function properly and divide mitotically even though they do not have
a)
Plasma membrane
b)
Cytoskeleton
c)
Plastids
d)
Mitochondria
|
Prakhar Maheshwari answered |
Plastids have no role in mitotic division of a cell. They are only responsible for colors.
Eg;
Animal cells do not have plastids yet they can divide.
Cristae are associated with which of the following?- a)Endoplasmic reticulum
- b)Mitochondria
- c)Protoplasm
- d)Cytoplasm
Correct answer is option 'B'. Can you explain this answer?
Cristae are associated with which of the following?
a)
Endoplasmic reticulum
b)
Mitochondria
c)
Protoplasm
d)
Cytoplasm
|
|
Stuti Sen answered |
**Mitochondria and Cristae**
The correct answer is option B: Mitochondria. Cristae are indeed associated with mitochondria.
**Explanation**
Mitochondria are double-membrane-bound organelles found in most eukaryotic cells. They are often referred to as the "powerhouses" of the cell because they generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.
One important feature of mitochondria is their inner membrane, which is highly folded to form structures called cristae. Cristae are invaginations or inward folds of the inner mitochondrial membrane. These folds increase the surface area of the inner membrane, allowing for more space where ATP synthesis can occur.
**Function of Cristae**
The presence of cristae in mitochondria is crucial for their function. The inner membrane of the mitochondria contains the electron transport chain (ETC) complexes, which play a key role in generating ATP through aerobic respiration. The ETC complexes are responsible for transferring electrons from electron donors to electron acceptors, creating a proton gradient across the inner mitochondrial membrane. This proton gradient is then used to drive the synthesis of ATP.
The highly folded structure of cristae increases the surface area available for the ETC complexes and ATP synthase, which are embedded in the inner membrane. This allows for more efficient ATP production, as there is a higher concentration of these proteins in the cristae. The increased surface area also allows for more efficient electron transfer and proton pumping, further enhancing ATP synthesis.
**Summary**
Cristae are associated with mitochondria. They are invaginations or inward folds of the inner mitochondrial membrane. The presence of cristae increases the surface area of the inner membrane, allowing for more efficient ATP synthesis through the electron transport chain and ATP synthase.
The correct answer is option B: Mitochondria. Cristae are indeed associated with mitochondria.
**Explanation**
Mitochondria are double-membrane-bound organelles found in most eukaryotic cells. They are often referred to as the "powerhouses" of the cell because they generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.
One important feature of mitochondria is their inner membrane, which is highly folded to form structures called cristae. Cristae are invaginations or inward folds of the inner mitochondrial membrane. These folds increase the surface area of the inner membrane, allowing for more space where ATP synthesis can occur.
**Function of Cristae**
The presence of cristae in mitochondria is crucial for their function. The inner membrane of the mitochondria contains the electron transport chain (ETC) complexes, which play a key role in generating ATP through aerobic respiration. The ETC complexes are responsible for transferring electrons from electron donors to electron acceptors, creating a proton gradient across the inner mitochondrial membrane. This proton gradient is then used to drive the synthesis of ATP.
The highly folded structure of cristae increases the surface area available for the ETC complexes and ATP synthase, which are embedded in the inner membrane. This allows for more efficient ATP production, as there is a higher concentration of these proteins in the cristae. The increased surface area also allows for more efficient electron transfer and proton pumping, further enhancing ATP synthesis.
**Summary**
Cristae are associated with mitochondria. They are invaginations or inward folds of the inner mitochondrial membrane. The presence of cristae increases the surface area of the inner membrane, allowing for more efficient ATP synthesis through the electron transport chain and ATP synthase.
Small particles projecting from the inner membrane and cristae of mitochondria are- a)Oxysomes
- b)Microsomes
- c)Informosomes
- d)Myeloid bodies
Correct answer is option 'A'. Can you explain this answer?
Small particles projecting from the inner membrane and cristae of mitochondria are
a)
Oxysomes
b)
Microsomes
c)
Informosomes
d)
Myeloid bodies
|
C.k Singh answered |
Oxysomes are the structure present in the inner surface of mitochondra.it is also known as f0-f1particle or Atp synthese.oxysomes play an important role in formation energy for the functioning of the cell.oxysome help in the electron transport i.e oxidation and reduction rxn in respiration.
Which of the following statements is true for a secretory cell?- a)Golgi apparatus is absent
- b)Only Smooth Endoplasmic Reticulum (SER) is present
- c)Rough Endoplasmic Reticulum (RER) is easily observed in the cell
- d)Secretory granules are formed in nucleus
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is true for a secretory cell?
a)
Golgi apparatus is absent
b)
Only Smooth Endoplasmic Reticulum (SER) is present
c)
Rough Endoplasmic Reticulum (RER) is easily observed in the cell
d)
Secretory granules are formed in nucleus
|
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Shatabdi Malik answered |
The RER often occurs deep in the cytoplasm. It is particularly highly developed in the cells that synthesise and secrete proteins. These include liver cells, pancreatic cells, goblet cells, plasma cells, fibroblasts, etc.So, the correct answer is 'RER is easily observed in the cell'.
Cell wall is absent in : [2015 RS]- a)Funaria
- b)Mycoplasma
- c)Nostoc
- d)Aspergillus
Correct answer is option 'B'. Can you explain this answer?
Cell wall is absent in : [2015 RS]
a)
Funaria
b)
Mycoplasma
c)
Nostoc
d)
Aspergillus
|
Dipanjan Mehta answered |
(b) Mycoplasma lacks cell wall.
Which ion holds the ribosomal subunits together- a)Ca+2
- b)Mn+2
- c)Mg+2
- d)Na+
Correct answer is option 'C'. Can you explain this answer?
Which ion holds the ribosomal subunits together
a)
Ca+2
b)
Mn+2
c)
Mg+2
d)
Na+
|
Hansa Sharma answered |
Owing to its abundance and highest charge density among all biological ions, magnesium is most suitable for neutralizing the negative charge density of RNA nucleotide backbone. Ribosomal subunits associate to form complete ribosome in presence of Mg ion.
Plastids which store fats and oils are called:-- a)Aleuroplast
- b)Amyloplast
- c)Etioplast
- d)Elaioplast
Correct answer is option 'D'. Can you explain this answer?
Plastids which store fats and oils are called:-
a)
Aleuroplast
b)
Amyloplast
c)
Etioplast
d)
Elaioplast
|
|
ภ๏๓คคภ answered |
The main function of elaioplasts are synthesis and storage of fatty acids, terpenes, and other lipids
Centrioles are found in:-- a)Chromosomes
- b)Nucleus
- c)Centrosome
- d)Centromere
Correct answer is option 'C'. Can you explain this answer?
Centrioles are found in:-
a)
Chromosomes
b)
Nucleus
c)
Centrosome
d)
Centromere
|
|
Siddheshwar Kale answered |
Centrosomes are composed of two centrioles lies perpendicular to each other. that's why centrosomes also called diplosome.
The inner membrane of mitochondria thrown into folds to form finger like structure is called- a)Matrix
- b)Inter membrane space
- c)Amyloplast
- d)Cristae
Correct answer is option 'D'. Can you explain this answer?
The inner membrane of mitochondria thrown into folds to form finger like structure is called
a)
Matrix
b)
Inter membrane space
c)
Amyloplast
d)
Cristae
|
Palak Khanna answered |
Mitochondria are double membranous structure. The inner membrane of mitochondria thrown into folds to form finger-like structureis called cristae.
In which tubulin protein is not present :–- a)Plasma membrane
- b)Cilia
- c)Flagella
- d)Microtubules
Correct answer is option 'A'. Can you explain this answer?
In which tubulin protein is not present :–
a)
Plasma membrane
b)
Cilia
c)
Flagella
d)
Microtubules
|
Ananya Basak answered |
There is no tubulin protein present in the myosin protein. Myosin is a motor protein that is involved in muscle contraction and movement. Tubulin, on the other hand, is a structural protein that forms the microtubules, which are important for cell division, intracellular transport, and maintaining cell shape.
Which is not true about sphaerosomes :-- a)Involved in photorespiration
- b)Arise from E.R.
- c)Related to fat metbolism
- d)Single membane bound
Correct answer is option 'A'. Can you explain this answer?
Which is not true about sphaerosomes :-
a)
Involved in photorespiration
b)
Arise from E.R.
c)
Related to fat metbolism
d)
Single membane bound
|
Suresh Iyer answered |
Spherosomes or oleosomes are small cellular organelles enclosed by a single membrane that is responsible for the storage and synthesis of lipid.
They are obtained from the endoplasmic reticulum, they are surrounded by a single phospholipid monolayer and are found in only plant cells.
So, the correct answer is 'Involved in photorespiration'.
They are obtained from the endoplasmic reticulum, they are surrounded by a single phospholipid monolayer and are found in only plant cells.
So, the correct answer is 'Involved in photorespiration'.
Which of the following statements is not correct? (2019)- a)Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
- b)Lysosomes have numerous hydrolytic enzymes.
- c)The hydrolytic enzymes of lysosomes are active under acidic pH.
- d)Lysosomes are membrane-bound structures.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements is not correct? (2019)
a)
Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
b)
Lysosomes have numerous hydrolytic enzymes.
c)
The hydrolytic enzymes of lysosomes are active under acidic pH.
d)
Lysosomes are membrane-bound structures.
|
Jyoti Sengupta answered |
- Lysosomes bud off from trans face to Golgi bodies.Precursor of lysosomal enzymes are synthesized by RER and then send to Golgi bodies for further processing.
So, the correct answer is 'Lysosomes are formed by the process of packaging in the endoplasmic reticulum'
Select the wrong statement with respect to the structure of a plant cell.- a)Cellulosic cell wall is present inside the cell membrane.
- b)Centrioles are usually absent.
- c)A large central vacuole is present.
- d)Golgi apparatus is formed of a number of unconnected units called dictyosomes.
Correct answer is option 'A'. Can you explain this answer?
Select the wrong statement with respect to the structure of a plant cell.
a)
Cellulosic cell wall is present inside the cell membrane.
b)
Centrioles are usually absent.
c)
A large central vacuole is present.
d)
Golgi apparatus is formed of a number of unconnected units called dictyosomes.
|
|
Akanksha Das answered |
Cell Structure of a Plant Cell
Introduction
A plant cell is a eukaryotic cell that makes up the structural and functional unit of plants. It contains various organelles that perform specific functions necessary for the cell's survival and growth. In this context, let's analyze the given options to identify the wrong statement regarding the structure of a plant cell.
Analysis of Statements
a) Cellulosic cell wall is present inside the cell membrane.
- This statement is incorrect. The cell wall is located outside the cell membrane in a plant cell. It provides rigidity, protection, and support to the cell. The primary component of the plant cell wall is cellulose, a complex carbohydrate.
b) Centrioles are usually absent.
- This statement is correct. Unlike animal cells, plant cells do not have centrioles. Centrioles are involved in cellular division and the formation of the spindle apparatus during mitosis. Plant cells undergo cell division through a different mechanism, and hence, centrioles are not present.
c) A large central vacuole is present.
- This statement is correct. Plant cells typically contain a large central vacuole that occupies a significant portion of the cell's volume. The vacuole is enclosed by a membrane called the tonoplast and plays a crucial role in maintaining cell turgidity, storing water, nutrients, and waste products.
d) Golgi apparatus is formed of a number of unconnected units called dictyosomes.
- This statement is correct. The Golgi apparatus in plant cells is composed of a stack of flattened, membrane-bound sacs called dictyosomes. These dictyosomes function in processing, modifying, and packaging proteins and lipids for transport to various destinations within and outside the cell.
Conclusion
Therefore, the wrong statement with respect to the structure of a plant cell is option 'A' - "Cellulosic cell wall is present inside the cell membrane." The cell wall is located outside the cell membrane in a plant cell.
Introduction
A plant cell is a eukaryotic cell that makes up the structural and functional unit of plants. It contains various organelles that perform specific functions necessary for the cell's survival and growth. In this context, let's analyze the given options to identify the wrong statement regarding the structure of a plant cell.
Analysis of Statements
a) Cellulosic cell wall is present inside the cell membrane.
- This statement is incorrect. The cell wall is located outside the cell membrane in a plant cell. It provides rigidity, protection, and support to the cell. The primary component of the plant cell wall is cellulose, a complex carbohydrate.
b) Centrioles are usually absent.
- This statement is correct. Unlike animal cells, plant cells do not have centrioles. Centrioles are involved in cellular division and the formation of the spindle apparatus during mitosis. Plant cells undergo cell division through a different mechanism, and hence, centrioles are not present.
c) A large central vacuole is present.
- This statement is correct. Plant cells typically contain a large central vacuole that occupies a significant portion of the cell's volume. The vacuole is enclosed by a membrane called the tonoplast and plays a crucial role in maintaining cell turgidity, storing water, nutrients, and waste products.
d) Golgi apparatus is formed of a number of unconnected units called dictyosomes.
- This statement is correct. The Golgi apparatus in plant cells is composed of a stack of flattened, membrane-bound sacs called dictyosomes. These dictyosomes function in processing, modifying, and packaging proteins and lipids for transport to various destinations within and outside the cell.
Conclusion
Therefore, the wrong statement with respect to the structure of a plant cell is option 'A' - "Cellulosic cell wall is present inside the cell membrane." The cell wall is located outside the cell membrane in a plant cell.
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