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31 Year NEET Previous Year Questions: Biomolecules - NEET MCQ


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55 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: Biomolecules

31 Year NEET Previous Year Questions: Biomolecules for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: Biomolecules questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Biomolecules MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Biomolecules below.
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31 Year NEET Previous Year Questions: Biomolecules - Question 1

Cellulose is a polymer of         [2002]

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

Enzymes are made up of        [2002]

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

Enzymes are made up of protein with specific
structure.

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31 Year NEET Previous Year Questions: Biomolecules - Question 3

Which is not a true statement?     [2002]

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

Glycolysis is [2003]

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

Phospholipids are esters of glycerol with         [2003]

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

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 7

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

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

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

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

Insulin helps in converting glucose to
glycogen

31 Year NEET Previous Year Questions: Biomolecules - Question 10

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 11

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

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

The helical structure of protein is stabilized by        [2004]

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 14

The cell membranes are mainly composed of        [2005]

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

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 16

The human body does not produce       [2006]

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 18

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

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

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

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

Thyroxine is an amino hormone.

31 Year NEET Previous Year Questions: Biomolecules - Question 20

In DNA, the complimentary bases are:        [2008]

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

Which of the following hormones containsiodine?       [2009]

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

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 24

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

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

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

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

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

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

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

Deficiency of vitamin B1 causes the disease           [2012]

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

Beri-Beri.

31 Year NEET Previous Year Questions: Biomolecules - Question 29

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 30

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

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

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

31 Year NEET Previous Year Questions: Biomolecules - Question 31

On hydrolysis of starch, we finally get [1991]

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

Manufacture - By hydrolysis of starch with
hot dil. mineral acids

31 Year NEET Previous Year Questions: Biomolecules - Question 32

The couplings between base units of DNA isthrough : [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 32

Structure of DNA - It consists of two
polynucleotide chains, each chain forms a
right handed helical spiral with ten bases in
one turn of the spiral. The two chains coil to
double helix and run in opposite direction
held together by hydrogen bonding.

31 Year NEET Previous Year Questions: Biomolecules - Question 33

Enzymes take part in a reaction and         [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 33

Enzymes being biocatalyst can increase the
rate of a reaction upto 10 million times. Even
very small amount can accelerate a reaction.

31 Year NEET Previous Year Questions: Biomolecules - Question 34

Chemically considering digestion is basically           [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 34

Basically digestion means hydrolysis.

31 Year NEET Previous Year Questions: Biomolecules - Question 35

The α-D glucose and β-D glucose differ from eachother due to difference in carbon atom withrespect to its     [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 35

α -D glucose and β–D glucose are the
isomers which differ in the orientation
(configuration) of H and OH groups around
C1 atom.

 

31 Year NEET Previous Year Questions: Biomolecules - Question 36

Which of the following protein destroy theantigen when it enters in body cell?         [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 36

When antigens enter in to the body cells
and destroy them, then antibodies being
proteins are synthesised in the body and
combine with antigens and destroy these
antigens by forming inactive complexes.
Therefore antibodies protein destroy
antigens.

31 Year NEET Previous Year Questions: Biomolecules - Question 37

In reference to biological role, Ca2+ ions areimportant in [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 37

The correct answer is option  B
Calcium ions (Ca2+) contribute to the physiology and biochemistry of organisms' cells. They play an important role in signal transduction pathways, where they act as a second messenger, in neurotransmitter release from neurons, in contraction of all muscle cell types, and in fertilization.

31 Year NEET Previous Year Questions: Biomolecules - Question 38

Sucrose in water is dextro-rotatory, [α]D= + 66.4º.When boiled with dilute HCl, the solutionbecomes leavo-rotatory, [α]D= –20º. In thisprocess the sucrose molecule breaks into[1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 38

The hydrolysis of sucrose by boiling with
mineral acid or by enzyme invertase or
sucrase produces a mixture of equal
molecules of D(+) glucose and
D(–) Fructose.

31 Year NEET Previous Year Questions: Biomolecules - Question 39

A reagent suitable for the determination of Nterminal residue of a peptide is [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 39

2, 4- Dinitroflurobenzene, also known as
Sanger's reagent, reacts with the H2N - group
of the peptide to from 2, 4- dinitrophenyl
(DNP) derivative of the peptide. The DNP
derivative of the peptide is hydrolysed to
give DNP derivative of the single amino acid

31 Year NEET Previous Year Questions: Biomolecules - Question 40

The reactions of (a) oxygen and (b) carbon monoxide with haeme (the prosthetic group of  haemoglobin) give

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 40

31 Year NEET Previous Year Questions: Biomolecules - Question 41

Identify an element amongst the following whichis responsible for oxidation of water to O2 in biological processes [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 41

 Water oxidation is catalyzed by a manganese-containing cofactor contained in photosystem II known as the oxygen-evolving complex. Manganese is an important cofactor, and calcium and chloride are also required for the reaction to occur.

31 Year NEET Previous Year Questions: Biomolecules - Question 42

Which one of the following chemical units is certainly to be found in an enzyme? [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 42

Peptide bonds are present in enzyme

 

31 Year NEET Previous Year Questions: Biomolecules - Question 43

The number of molecules of ATP produced in thelipid metabolism of a molecule of palmitic acid is   [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 43

We know that in the lipid metabolism, when
palmitic acid is oxidised, then two carbon
fragments are removed sequentially to form
acetyl coenzyme. It enters the citric acid
cycle for production of 130 ATP.

31 Year NEET Previous Year Questions: Biomolecules - Question 44

In DNA the complementary bases are         [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 44

In DNA, adenine faces thymine and guanine
faces cytosine.

31 Year NEET Previous Year Questions: Biomolecules - Question 45

Glucose molecule reacts with 'X' number ofmolecules of phenylhydrazine to yield osazone.The value of 'X' is [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 45

We know that glucose reacts with one
molecule of phenyl hydrazine to give phenyl
hydrazone. When warmed with excess of
phenylhydrazine, the secondary alcoholic
group adjacent to the aldehyde group is
oxidised by another molecule of
phenylhydrazine to a ketonic group. With this
ketonic group, the third molecule of
phenylhydrazine condenses to glucosazone.
Therefore the value of X is 3

31 Year NEET Previous Year Questions: Biomolecules - Question 46

Which of the following is the sweetest sugar?   [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 46

Fructose is the sweetest sugar.

31 Year NEET Previous Year Questions: Biomolecules - Question 47

In cells the net production of ATP moleculesgenerated from one glucose molecule is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 47

Net total number of ATP molecules evolved
= 36 molecules.

31 Year NEET Previous Year Questions: Biomolecules - Question 48

Which of the following is a steroid hormone? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 48

Progesterone (Gestogens) is a steroid
hormone, which controls the development
and maintainance of pregnancy. Thryoxine
and Adrenaline are Amine hormones.

31 Year NEET Previous Year Questions: Biomolecules - Question 49

The dominant cation in the blood plasma(extracellular fluid) is              [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 49

Na+, Cl and HCO3 are the electrolytes
present in plasma solutes in blood. Na+ and
Cl helps in maintainence of osmotic
pressure and fluid balance.

31 Year NEET Previous Year Questions: Biomolecules - Question 50

The number of essential amino acids in man is         

[2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 50

There are 20 amino acid in man out of which
10 amino acids are essential amino acids.
These essential amino acids are supplied to
our bodies by food which we take because
they cannot be synthesised in the body
.These are (i) valine (2) leucine (3) Isoleucine
(4) Phenyl alanine (5) Threonine (6)
Methionine (7) Lysine (8) Tryptho phone (9)
Arginine (10) Histidine.

31 Year NEET Previous Year Questions: Biomolecules - Question 51

Mg is present in which of the following :          [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 51

Chlorophyll contain Mg.

31 Year NEET Previous Year Questions: Biomolecules - Question 52

Which of the following gives positive Fehlingsolution test ?    [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 52

Glucose contain aldehyde group. Hence it
give positive fehling solution test.

31 Year NEET Previous Year Questions: Biomolecules - Question 53

For   (peptide bond)

Which statement is incorrect about peptide bond?            [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 53

Due to resonance C — N bond in protein acquires double bond character and is smaller than usual C — N bond.

31 Year NEET Previous Year Questions: Biomolecules - Question 54

Which is correct statement? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 54

Starch is also know as amylum which occurs
in all green plants. A molecule of starch
(C6H10O5 )n is built of a large number of
α-glucose ring joined through oxygen-atom.

31 Year NEET Previous Year Questions: Biomolecules - Question 55

Which of the following is correct about Hbondingin nucleotide? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Biomolecules - Question 55

The hydrogen bonds are formed between
the base (shown by dotted lines). Because
of size and geometrics of the bases, the only
possible pairing in DNA and between
G(Guanine) and C(Cytosine) through three
H-bonds and between A (Adenosine) and T
(Thymine) through two H-bonds.

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