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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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91 Easy

91 of 331

Understanding +4 | -1

Which one is not an example for hydrolases?

View answer and explanation

Correct option: A

Dehydrogenase

Option A (Dehydrogenase) is correct because dehydrogenases are oxidoreductases, not hydrolases. Hydrolases catalyze hydrolysis reactions.

92 Medium

92 of 331

Understanding +4 | -1

The following pair of elements are relatively abundant in living organisms than in earth’s crust

View answer and explanation

Correct option: D

Carbon, Hydrogen

Option D (Carbon, Hydrogen) is correct because living organisms are carbon-based and contain a high percentage of water (hydrogen and oxygen).

93 Easy

93 of 331

Understanding +4 | -1

Inhibition of enzyme activity by a molecule, which reversibly modifies the structure of the active site of the enzyme is called

View answer and explanation

Correct option: C

Allosteric inhibition

Option C (Allosteric inhibition) is correct because it involves a reversible modification of the enzyme's active site structure by a molecule binding at a site other than the active site.

94 Easy

94 of 331

Understanding +4 | -1

The amino acids are acidic, basic and neutral based on the number of

View answer and explanation

Correct option: B

Amino and carboxyl groups

Option B (Amino and carboxyl groups) is correct because the relative number of amino (-NH2) and carboxyl (-COOH) groups determines whether an amino acid is acidic, basic, or neutral.

95 Medium

95 of 331

Analyzing +4 | -1

Assertion (A): The Michaelis Menten constant

\left(\mathrm{K}_{\mathrm{m}}\right)

can be used to compare catalytic efficiency of two different enzymes.

Reason (R): The

\mathrm{K}_{\mathrm{m}}

value is numerically equal to the substrate concentration at which

\frac{1}{2}

V_{\max }

is achieved.

In the light of the above statements, choose the correct answer from the option given below.

View answer and explanation

Correct option: A

Both

(A)

and

(R)

are true and

(R)

is not correct explanation of

(A)

Option A (Both (A) and (R) are true and (R) is not correct explanation of (A)) is correct because both statements are true, but the reason doesn't explain why Km can be used to compare catalytic efficiency.

96 Hard

96 of 331

Remembering +4 | -1

Which of the following is the constituent of glycerol?

View answer and explanation

Correct option: A

3C

3-OH

group

Option A (

3C

3-OH

group) is correct because glycerol is a three-carbon molecule with three hydroxyl (-OH) groups, one attached to each carbon.

97 Medium

97 of 331

Remembering +4 | -1

The form of DNA with 34Å pitch with a rise per base pair of 3.4Å is called

View answer and explanation

Correct option: B

B-DNA

Option B (B-DNA) is correct because B-DNA is the most common form of DNA and has a pitch of 34Å with a rise per base pair of 3.4Å.

98 Hard

98 of 331

Remembering +4 | -1

Each protein has – amino acids?

View answer and explanation

Correct option: A

Option A (20) is correct because there are 20 standard amino acids that are commonly found in proteins.

99 Medium

99 of 331

Understanding +4 | -1

Sugar-phosphate backbone in nucleic acid

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because the sugar-phosphate backbone is hydrophilic, negatively charged due to the phosphate groups, and exhibits polarity.

100 Medium

100 of 331

Analyzing +4 | -1

Identify the ascending sequence of the Classes of the following enzymes as per the IUB system

I. Arginosuccinase
II. Nitrate reductase
III. Pepsin
IV. Hexokinase

View answer and explanation

Correct option: C

II,IV,III,I

Option D (Polynucleotide – Hydrogen bond) is the odd one because polynucleotides are linked by phosphodiester bonds, not hydrogen bonds (which hold the two strands of DNA together).

101 Easy

101 of 331

Remembering +4 | -1

Select the correct pair of substituted purines

View answer and explanation

Correct option: B

Adenine and guanine

Option B (Adenine and guanine) is correct because both adenine and guanine are purines, which are nitrogenous bases with a two-ring structure.

102 Medium

102 of 331

Understanding +4 | -1

Which of the following statements are correct?
I. Acetic acid can form cholesterol
II. Flow of metabolites through metabolic pathway has a definite rate and direction. It is called dynamic state of body constituents
III. Anabolic pathway is endergonic while catabolic pathway is exergonic
IV. All biomolecules have a term over, i.e., they are constantly being changed into some other biomolecules and also made from other biomolecules
The correct options is

View answer and explanation

Correct option: A

All are correct

Option A (All are correct) is correct because all the statements accurately describe metabolic processes and biomolecule dynamics.

103 Hard

103 of 331

Remembering +4 | -1

Aromatic amino acids are

View answer and explanation

Correct option: A

Phenylalanine, tryptophan, tyrosine

Option A (Phenylalanine, tryptophan, tyrosine) is correct because these are the three standard amino acids with aromatic side chains.

104 Medium

104 of 331

Understanding +4 | -1

Which of the following statement is wrong regarding chitin?

View answer and explanation

Correct option: A

It is a storage polysaccharide

Option A is correct because chitin is a structural polysaccharide, not a storage polysaccharide.

105 Hard

105 of 331

Understanding +4 | -1

Read the following statements carefully and choose the option that is incorrectly explained.

View answer and explanation

Correct option: D

The sugar found in polynucleotides is always ribose.

Option D (The sugar found in polynucleotides is always ribose) is incorrectly explained because DNA contains deoxyribose, while RNA contains ribose.

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106 Hard

106 of 331

Analyzing +4 | -1

Mark the odd pair in the followings

View answer and explanation

Correct option: C

Glycerol – Fatty acids

Option C (Glycerol – Fatty acids) is correct because glycerol and fatty acids are components *of* lipids, not building blocks linked together to form a larger molecule.

107 Medium

107 of 331

Application +4 | -1

If in a ds B-DNA fragment 200 bases are present then what would be its length?

View answer and explanation

Correct option: A

340 \mathrm{~A}

Option A (

340 \mathrm{~A}

) is correct because each base pair in B-DNA is 3.4 Å, so 200 bases (100 base pairs) is 3.4 Å * 100 = 340 Å.

108 Medium

108 of 331

Understanding +4 | -1

A phosphoglyceride is always made up of

View answer and explanation

Correct option: C

A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.

Option C (A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached) is correct because phosphoglycerides contain a glycerol backbone, fatty acids (saturated or unsaturated), and a phosphate group.

109 Easy

109 of 331

Remembering +4 | -1

The aggregation of the various kinds of biomolecules in a cell is referred to as the

View answer and explanation

Correct option: C

Cellular pool

Option C is correct because the aggregation of various biomolecules in a cell is referred to as the cellular pool.

110 Easy

110 of 331

Understanding +4 | -1

Choose the correct statement

View answer and explanation

Correct option: D

All are correct

Option D (All are correct) is correct because the living state is indeed a non-equilibrium steady state to perform work, the constant flow of material prevents equilibrium, and living state and metabolism are closely linked.

111 Hard

111 of 331

Application +4 | -1

What is the formula of a polypeptide consisting of 10-glycine molecule?

The formula of glycine is

{C_2}{H_5}N{O_2}

View answer and explanation

Correct option: D

{C_{20}}{H_{32}}{O_{11}}{N_{10}}

The correct answer is

{C_{20}}{H_{32}}{O_{11}}{N_{10}}

because each peptide bond formation removes one water molecule, so 9 water molecules are removed from 10 glycine molecules.

112 Medium

112 of 331

Remembering +4 | -1

A series of reactions which occur to form a compound (or) degrade a compound put together are called

View answer and explanation

Correct option: A

metabolism

Option A (metabolism) is correct because metabolism encompasses all chemical reactions within an organism, including both building up (anabolism) and breaking down (catabolism) processes.

113 Medium

113 of 331

Analyzing +4 | -1

How many of the below given macromolecules are not correctly paired with one of their characteristics?

a. Chitin - Its basic unit is a nitrogen containing glucose derivative.

b. Cellulose - Unbranched polymer of glucose which produces blue colour with iodine.

c. Haemoglobin - Has four subunits i.e., polypeptide chains forming a quaternary structure.

d. GLUT 4 - Enables insulin transport into cells.

View answer and explanation

Correct option: B

Two

Option Two is correct because cellulose does not produce a blue color with iodine, and GLUT 4 enables glucose transport, not insulin transport.

114 Hard

114 of 331

Remembering +4 | -1

All the following radionuclei are used in the study of DNA except:

View answer and explanation

Correct option: D

{ }^{51} {Cr}

Option D (

{ }^{51} {Cr}

) is correct because

{ }^{14} {C}

{ }^{32} {P}

, and

{ }^{15} {~N}

are commonly used to label DNA components (bases, phosphate, and nitrogenous bases respectively), while

{ }^{51} {Cr}

is not typically used in DNA studies.

115 Hard

115 of 331

Remembering +4 | -1

Every enzyme in IUB system of classification has been given a code number which consists of

View answer and explanation

Correct option: C

4 Digits

Option C (4 Digits) is correct because the IUB system assigns a 4-digit code to each enzyme for classification.

116 Hard

116 of 331

Understanding +4 | -1

Assertion (A): Amino acids are interliked by hydrogen bonds to form secondary structure in a polypeptide chain.

Reason (R): Beta pleated sheet and alpha helices are secondary structures shown by polypeptide chain.

View answer and explanation

Correct option: B

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

Option B (Both (A) & (R) are true but the (R) is not the correct explanation of the (A)) is correct because amino acids are interlinked by peptide bonds, not hydrogen bonds, to form the secondary structure, but beta pleated sheets and alpha helices are indeed secondary structures.

117 Medium

117 of 331

Remembering +4 | -1

In a polypeptide the first amino acid is represented as

View answer and explanation

Correct option: A

N-terminal on left hand

Option A (N-terminal on left hand) is correct because, by convention, polypeptides are written with the N-terminal end (amino group) on the left and the C-terminal end (carboxyl group) on the right.

118 Hard

118 of 331

Remembering +4 | -1

Identify set of polysaccharides from the following

View answer and explanation

Correct option: D

Glycogen, Cellulose, Starch

Option D (Glycogen, Cellulose, Starch) is correct because glycogen, cellulose, and starch are all polysaccharides.

119 Medium

119 of 331

Remembering +4 | -1

Enzymes that catalyze inter-conversion of optical, geometrical or positional isomers, are

View answer and explanation

Correct option: D

Isomerases

Option D (Isomerases) is correct because isomerases catalyze the interconversion of isomers.

120 Easy

120 of 331

Understanding +4 | -1

Which one of the following is wrongly matched?

View answer and explanation

Correct option: C

Enzyme – Lipopolysaccharide

Option C (Enzyme – Lipopolysaccharide) is correct because enzymes are proteins, not lipopolysaccharides. Lipopolysaccharides are components of bacterial cell walls.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

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Biomolecules practice · Mixed difficulty

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