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31 Year NEET Previous Year Questions: Biomolecules - 1


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30 Questions MCQ Test Chemistry 31 Years NEET Chapterwise Solved Papers | 31 Year NEET Previous Year Questions: Biomolecules - 1

31 Year NEET Previous Year Questions: Biomolecules - 1 for NEET 2022 is part of Chemistry 31 Years NEET Chapterwise Solved Papers preparation. The 31 Year NEET Previous Year Questions: Biomolecules - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Biomolecules - 1 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Biomolecules - 1 below.
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31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 1

Cellulose is a polymer of         [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 1

We know that cellulose (C6H12O6 )n is the
chief constituent of cell walls of plants. It is
the most abundant organic substance found
in nature. It is a polymer of glucose with
3500 repeat units in a chain.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 2

Enzymes are made up of        [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 2

Enzymes are made up of protein with specific
structure.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 3

Which is not a true statement?     [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 3

All proteins are not found in L-form but they
may be present in form of D or L

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 4

Glycolysis is [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 4

It is a common pathway for both the aerobic
& anaerobic respiration in which 1 glucose
molecule is converted to 2 molecules of
pyruvate.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 5

Phospholipids are esters of glycerol with         [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 5

Phospholipids are derivatives of glycerol in
which two of the hydroxyl groups are
esterified with fatty acids while the third is
esterified with some derivative of phosphoric
acid with some alcohol such as choline,
ethanolamine, serine or inositol.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 6

Chargaff's rule states that in an organism          [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 6

Amount of A = T and that of G = C.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 7

Which one of the following structures represents the peptide chain? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 7

The correct answer is Option C.
A peptide chain must have alternate C=O and NH groups from the peptide linkages. This is seen only in option C.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 8

A sequence of how many nucleotides inmessenger RNA makes a codon for an amino acid?   [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 8

The bond formed between two amino acids
by the elimination of a water molecule is
called a peptide linkage or bond. The peptide
bond is simply another name for amide bond.

The product formed by linking amino acid
molecules through peptide linkages. —
CO—NH—, is called a peptide

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 9

The hormone that helps in the conversion ofglucose to glycogen is      [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 9

Insulin helps in converting glucose to
glycogen

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 10

The enzyme which hydrolyses triglycerides tofatty acids and glycerol is called        [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 10

Triglycerides are lipids, hence these are
hydrolysed by lipases to glycerol and fatty
acids.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 11

The correct statement in respect of protein haemoglobin is that it     [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 11

Haemoglobin acts as an oxygen carrier in
the blood since it reacts with oxygen to form
unstable oxyhaemoglobin which easily
breaks to give back haemoglobin and
oxygen.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 12

The helical structure of protein is stabilized by        [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 12

The α-helix structure is formed when the
chain of α-amino acids coils as a right
handed screw (called α-helix) because of the
formation of hydrogen bonds between
amide groups of the same peptide chain, i.e.,
NH group in one unit is linked to carbonyl
oxygen of the third unit by hydrogen
bonding. This hydrogen bonding between
different units is responsible for holding
helix in a position.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 13

Which functional group participates indisulphide bond formation in proteins?      [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 13

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 14

The cell membranes are mainly composed of        [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 14

Cell membranes (Plasma membranes) constitutes bilayer of phospholipid with embedded proteins. In humans, lipids accounts for upto 79% of cell membrance.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 15

Which one of the following is a peptide hormone ? [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 15

Testorterone and Adrenaline are steroid
harmone, Thyroxin is non-steroided harmone
glucagon is peptide harmone.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 16

The human body does not produce       [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 16

Vitamins are organic substances which does
not provide energy but are essential for
healthy growth and proper functioning of
body. Vitamins are not synthesized inside
human body but they are essential part of
our diet.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 17

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process 

          are respectively                 [2006]
 

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 17

Pepsin and Trypsin are two enzymes
involved in the process (hydrolysis of
proteins)

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 18

RNA and DNA are chiral molecules, their chiralityis due to [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 18

Each nucleic acid consists of a pentose
sugar a heterocyclic base, and phosphoric
acid. The sugar present in DNA is 2-deoxy
-D (–) ribose and the sugar present in RNA
is D (–)- ribose. The chirality of DNA and
RNA molecules are due to the presence of
sugar components.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 19

Which one of the following is an amine hormone ?        [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 19

Thyroxine is an amino hormone.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 20

In DNA, the complimentary bases are:        [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 20

In DNA the complimentary base are
Adenine and thymine.
Guanine and cytosine
The genetic information for cell is contained
in the sequence of bases A, T, G and C in
DNA molecule.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 21

The segment of DNA which acts as theinstrumental manual for the synthesis of the protein is:    [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 21

The DNA sequence that codes for a specific
protein is called a Gene and thus every
protein in a cell has a corrosponding gene.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 22

Which of the following hormones containsiodine?       [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 22

Thyroxine is the only hormone among the
given choices that contains iodine. Its
structure is as follows:

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 23

Which one of the following does not exhibit thephenomenon of mutarotation ?       [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 23

Sucrose does not have free — CHO or
CO group, hence it does not undergo
mutarotation.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 24

Fructose reduces Tollen’s reagent due to:[2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 24

The correct answer is Option A.

Fructose reduces Tollen's reagent due to enolisation of fructose followed by conversion to aldehyde by base.
 
Only aldehydes reduce Tollen's reagent. But fructose is a ketone.
 
In aqueous solution, fructose is enolised and then converted into aldehyde in basic medium. 
 
All aldehydes generally reduce Tollen's reagent, thus fructose also reduces Tollen's reagent.
 

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 25

Which one of the following statements is nottrue regarding (+) Lactose ?  [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 25

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 26

Which of the statements about "Denaturation" given below are correct ?        [2011 M]

(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

(b) Denturation leads to the conversion of double strand of DNA into single strand

(c) Denaturation affects primary strucrture which gets distorted

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 26

When the proteins are subjected to the
action of heat, mineral acids or alkali, the
water soluble form of globular protein
changes to water insoluble fibrous protein.
This is called denaturation of proteins.
During denaturation secondary and tertiary
structures of protein destroyed but primary
structures remains intact.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 27

Which one of the following, statements isincorrect about enzyme catalysis?   [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 27

Enzymes are most reactive at optimum
temperature. The optimum temperature for
enzyme activity lies between 40°C to 60°C.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 28

Deficiency of vitamin B1 causes the disease           [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 28

Beri-Beri.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 29

Which one of the following sets of monosaccharidesforms sucrose? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 29

Sucrose is a disaccharide of α–DGlucopyranose
and β–D-Fructofuranose.

31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 30

In DNA the linkages between differentnitrogenous bases are:    [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - 1 - Question 30

The base pairs of the two strands of DNA
are linked together through H-bonds.

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