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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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121 Medium

121 of 331

Remembering +4 | -1

An organic substance bound to an enzyme and essential for its activity, is called

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Correct option: A

Coenzyme

Option A (Coenzyme) is correct because a coenzyme is an organic substance bound to an enzyme and essential for its activity.

122 Medium

122 of 331

Application +4 | -1

If a B-DNA contains 40% thymine then calculate the sum total of thymine and guanine.

View answer and explanation

Correct option: D

0.5

Option D (0.5) is correct because in B-DNA, A=T and G=C. If T is 40%, then A is also 40%. Therefore, G+C = 100% - 80% = 20%, so G=C=10%. Thus, T+G = 40% + 10% = 50% or 0.5.

123 Hard

123 of 331

Understanding +4 | -1

Select false statements for an enzyme promoting a chemical reaction by
(i) Lowering the energy of activation.
(ii) Causing the release of heat, which acts as a primer.
(iii) Increasing molecular motion.
(iv) Changing the free energy difference between substrate and product.

View answer and explanation

Correct option: C

(ii), (iii) and (iv)

Option B ((ii) and (iii)) is correct because enzymes lower the activation energy, but do not cause the release of heat, increase molecular motion, or change the free energy difference.

124 Medium

124 of 331

Understanding +4 | -1

Consider the following statements:
i) In proteins, right handed helices are observed
ii) In a polysaccharide chain, the right end is called the reducing end
iii) B-DNA is generally coiled in left handed fashion
Which of the statement(s) given above is/are incorrect?

View answer and explanation

Correct option: A

(iii) only

Option A ((iii) only) is correct because B-DNA is generally coiled in a right-handed fashion, not left-handed.

125 Easy

125 of 331

Understanding +4 | -1

Read the two reaction A and B given below and select the correct option accordingly
A. ADP + Pi → ATP
B. ATP → ADP + Pi

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Correct option: A

A-Endergonic; B-Exergonic

Option A (A-Endergonic; B-Exergonic) is correct because the formation of ATP from ADP and Pi (A) requires energy input (endergonic), while the breakdown of ATP into ADP and Pi (B) releases energy (exergonic).

126 Easy

126 of 331

Remembering +4 | -1

Which is a reducing sugar?

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Correct option: A

Galactose

Option A (Galactose) is correct because galactose is a monosaccharide with a free aldehyde or ketone group, allowing it to act as a reducing agent.

127 Easy

127 of 331

Understanding +4 | -1

Lactose is an example of all except

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Correct option: A

Monosaccharide

Option A (Monosaccharide) is correct because lactose is a disaccharide composed of two monosaccharides (glucose and galactose).

128 Easy

128 of 331

Understanding +4 | -1

Find out the wrongly matched pair.

View answer and explanation

Correct option: D

Cellulose – Heteropolymer

Option D (Cellulose – Heteropolymer) is correct because cellulose is a homopolymer, not a heteropolymer. It is made up of only glucose monomers.

129 Hard

129 of 331

Understanding +4 | -1

Phosphodiester bond is formed between

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Correct option: C

{3^1}

carbon of sugar of one nucleotide and

{5^1}

carbon of sugar of another nucleotide

Option C (

{3^1}

carbon of sugar of one nucleotide and

{5^1}

carbon of sugar of another nucleotide) is correct because a phosphodiester bond links the 3' carbon of one nucleotide's sugar to the 5' carbon of the next nucleotide's sugar.

130 Hard

130 of 331

Remembering +4 | -1

Cellulose is

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Correct option: B

Homo polysaccharide

Option B (Homo polysaccharide) is correct because cellulose is made up of only one type of monosaccharide (glucose), making it a homopolysaccharide.

131 Easy

131 of 331

Remembering +4 | -1

Adult human haemoglobin consists of

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Correct option: C

4 subunits (2α,2β)

Option C (4 subunits (2α,2β)) is correct because adult human hemoglobin consists of two alpha and two beta subunits.

132 Hard

132 of 331

Remembering +4 | -1

The acid used for preliminary separation of biomolecule in a living tissue is

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Correct option: C

Trichloro acetic acid

Option C (Trichloro acetic acid) is correct because trichloroacetic acid (TCA) is commonly used for the preliminary separation of biomolecules in living tissues.

133 Medium

133 of 331

Understanding +4 | -1

Which of the following is a heteropolymer?

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Correct option: B

Peptidoglycan

Option B (Peptidoglycan) is correct because it is a polymer made of different types of monomers, unlike the other options which are homopolymers.

134 Medium

134 of 331

Remembering +4 | -1

Primary structure of proteins is due to the presence of

View answer and explanation

Correct option: A

Peptide bond

Option A (Peptide bond) is correct because the primary structure of a protein is the sequence of amino acids linked by peptide bonds.

135 Hard

135 of 331

Understanding +4 | -1

Cellulose does not form blue colour with Iodine because

View answer and explanation

Correct option: A

It does not contain complex helices and hence cannot hold iodine molecules

Option A (It does not contain complex helices and hence cannot hold iodine molecules) is correct because cellulose lacks the helical structure necessary to trap iodine molecules, unlike starch.

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136 Medium

136 of 331

Analyzing +4 | -1

Assertion: Living organisms have more nitrogen and oxygen per unit mass than inanimate objects (e.g., earth crust).

Reason: Living organisms have more

Ca, Mg, Na

in them than inanimate object.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C is correct because the assertion is true, but the reason is false. Living organisms do have more nitrogen and oxygen, but not necessarily more Ca, Mg, and Na.

137 Hard

137 of 331

Understanding +4 | -1

The correct arrangement of these biomolecules in increasing order of their molecular weight is

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Correct option: C

AMP, ADP, ATP, DNA

Option C (AMP, ADP, ATP, DNA) is correct because the molecular weight increases with the addition of phosphate groups, and DNA is a large polymer.

138 Medium

138 of 331

Analyzing +4 | -1

Assertion (A): Lipids whose molecular weight does not exceed 800 Dalton come under acid insoluble fraction.

Reason (R): Lipids are present not only as such but also arranged in structures like membranes during grindig these lipid from vesicle.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A is correct because lipids, even with low molecular weight, are found in the acid-insoluble fraction due to their arrangement in structures like membranes.

139 Easy

139 of 331

Remembering +4 | -1

Which one is a polymer?

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Correct option: B

Glycogen

Option B (Glycogen) is correct because glycogen is a polysaccharide, a polymer of glucose monomers.

140 Medium

140 of 331

Remembering +4 | -1

Given below is the chemical formula of

\mathrm{C}{\mathrm{H}_3}{\left( {\mathrm{C}{\mathrm{H}_2}} \right)_{14}} - \mathop \mathrm{C}\limits^{\mathop {||}\limits^O } - \mathrm{OH}

View answer and explanation

Correct option: A

Palmitic acid

Option A (Palmitic acid) is correct because the chemical formula corresponds to a 16-carbon saturated fatty acid, which is palmitic acid.

141 Hard

141 of 331

Understanding +4 | -1

Assertion (A): In solutions of different pH, the structure of amino acids changes.

Reason (R): A particular property of amino acids is the ionizable nature of

-\mathrm{NH}_2

and -COOH groups.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

The correct answer is A because the structure of amino acids changes with pH due to the ionizable nature of the amino and carboxyl groups.

142 Medium

142 of 331

Understanding +4 | -1

Fluidity of bio-membranes can be shown by

View answer and explanation

Correct option: D

Fluorescence microscope

Option D is correct because fluorescence microscopy can track the movement of fluorescently labeled lipids and proteins in the membrane.

143 Easy

143 of 331

Remembering +4 | -1

Identify, in which of the following carbon compounds, heterocyclic rings can be found?

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Correct option: C

Nitrogen bases

Option C (Nitrogen bases) is correct because nitrogenous bases (adenine, guanine, cytosine, thymine, and uracil) contain heterocyclic rings.

144 Medium

144 of 331

Remembering +4 | -1

The bond present between two carbohydrate molecules is

View answer and explanation

Correct option: C

Glycosidic

Option C (Glycosidic) is correct because a glycosidic bond is the covalent bond that joins two carbohydrate molecules.

145 Hard

145 of 331

Remembering +4 | -1

Which of the following is the toxin?

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Correct option: B

Abrin

Option B (Abrin) is correct because Abrin is a highly toxic protein found in the seeds of the rosary pea.

146 Hard

146 of 331

Analyzing +4 | -1

Assertion (A): Coenzymes are proteinous structures without which certain enzymes are inactive
Reason (R): Coenzymes are tightly bound to apoenzymes

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Correct option: D

Both A and R are incorrect

Option D is correct because coenzymes are non-protein organic molecules, and they are loosely bound to apoenzymes, not tightly bound.

147 Easy

147 of 331

Remembering +4 | -1

Removal of amino group from an amino acid is known as

View answer and explanation

Correct option: A

Deamination

Option A (Deamination) is correct because deamination is the process of removing an amino group from a molecule, specifically an amino acid in this context.

148 Medium

148 of 331

Remembering +4 | -1

Which of the following statements is wrong?

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Correct option: C

Glycine is a sulphur containing amino acid

Option C (Glycine is a sulphur containing amino acid) is wrong because Glycine is the simplest amino acid and does not contain sulfur. Cysteine and Methionine are sulfur-containing amino acids.

149 Hard

149 of 331

Remembering +4 | -1

The high energy bonds of ATP are present between:

View answer and explanation

Correct option: D

\mathrm{O}-\mathrm{P}

Option D (

\mathrm{O}-\mathrm{P}

) is correct because the high-energy bonds in ATP are the phosphoanhydride bonds between the phosphate groups, which are O-P bonds.

150 Hard

150 of 331

Remembering +4 | -1

The type of bond formed between hydrodeyl group of sugar and phosphate is

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Correct option: A

ester bond

Option A (ester bond) is correct because an ester bond is formed between a hydroxyl group of sugar and a phosphate group.

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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