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Test: The Fundamental Unit of Life- 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: The Fundamental Unit of Life- 1

Test: The Fundamental Unit of Life- 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: The Fundamental Unit of Life- 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: The Fundamental Unit of Life- 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: The Fundamental Unit of Life- 1 below.
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Test: The Fundamental Unit of Life- 1 - Question 1

The structure/organelle of a cell that functions as a passage for intracellular transport as well as a manufacturing surface, is

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 1

The endoplasmic reticulum functions both as a passageway for intracellular transport and as a manufacturing surface.

Test: The Fundamental Unit of Life- 1 - Question 2

Select the odd one out.

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 2

 Each cell is bounded by an extremely delicate, thin elastic living membrane, called the plasma membrane. The plasma membrane is made up of two layers of lipid (fat) molecules with protein molecules which is sand witched between lipid layer.

Test: The Fundamental Unit of Life- 1 - Question 3

Analyse the statements and pick up the right one regarding mitochondrial membranes from the following :

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 3

Analysis of Mitochondrial Membranes

- Outer Mitochondrial Membrane: The outer mitochondrial membrane is quite porous because of the presence of many integral proteins known as porins. These proteins form channels that allow the free diffusion of molecules and ions up to a certain size, including small proteins.

- Inner Mitochondrial Membrane: The inner mitochondrial membrane is deeply folded, forming structures known as cristae. These folds increase the surface area of the membrane, thereby enhancing the ability of the mitochondria to produce ATP (adenosine triphosphate), which is the energy currency of the cell.

- Length of Membranes: The statement that the outer membrane is longer than the inner membrane is not correct. The length of the membranes is not a distinct feature of mitochondria. Instead, the inner membrane has more surface area due to its folds or cristae.

- Number of Membranes: Mitochondria are double-membraned organelles. They have an outer membrane and an inner membrane, separated by an intermembrane space. The statement that mitochondria mostly have a single membrane is incorrect.

So, based on the analysis, the correct statement regarding mitochondrial membranes is "The outer membrane is porous while the inner membrane is deeply folded".the inner membrane has more curls and turns compared to outer membrane , you can also take reference of brain(it has many curls and turns(neurons) and many experts say that our brains' neurons are much longer in length of our inner intestine(inner intestine measures 7 meters)).

Test: The Fundamental Unit of Life- 1 - Question 4

Organelle other than nucleus, containing DNA is

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 4

Beside nucleus, mitochondria is another cell organelle which has its own self-replicating DNA. It is known as mitochondrial DNA and thus called as a semi-autonomous organelle.

Test: The Fundamental Unit of Life- 1 - Question 5

The primary function of smooth endoplasmic reticulum in liver cells is

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 5

The function of smooth endoplasmic reticulum is to detoxify the poison and drugs present in our body.

Test: The Fundamental Unit of Life- 1 - Question 6

Which of these options are not a function of ribosomes?
(i) It helps in manufacture of protein molecules
(ii) It helps in manufacture of enzymes
(iii) It helps in manufacture of hormones.
(iv) It helps in manufacture of starch molecules

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 6

Ribosomes are majorly involved in protein synthesis, as these are the sites of protein synthesis and enzymes. It also synthesizes amino acids which polymerize to form proteins.

So option C is correct.

Test: The Fundamental Unit of Life- 1 - Question 7

In plant cells, many substances important for life are stored in

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 7

Vacoules store excess food of cell, when it is emergency they release them and in plant cells the vacoules are larger in size(compared to animal cells) because plants can not move

Test: The Fundamental Unit of Life- 1 - Question 8

Which of the following are covered by a single membrane? 

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 8

Vacuole and lysosome are covered by a single membrane.

Test: The Fundamental Unit of Life- 1 - Question 9

The most abundant material in plant cell wall is

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 9

Cellulose is present in cell walls of all plants, and some bacteria, and is the most abundant natural polysaccharide on earth.

Test: The Fundamental Unit of Life- 1 - Question 10

 Which of these is not related to endoplasmic reticulum? 

Detailed Solution for Test: The Fundamental Unit of Life- 1 - Question 10

The site of energy generation is mitochondria. The endoplasmic reticulum is involved in the transportation of protein and other material as well as the site for some biochemical activities. 

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