NEET Biology Biomolecules MCQs Set 08

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Multiple Choice Questions

Question 1: Electron transferring enzymes belong to
(a) Transferases
(b) Oxidoreductases
(c) Lyases
(d) Isomerases
Show Answer & Explanation

Answer: (b) Oxidoreductases

Explanation:
1. The main enzymes of electron transport chain are dehydrogenase, reductase, cytochrome oxidase, which belongs to the oxidoreductase class of an enzyme.

Question 2: Which of the following are not polymeric?
(a) Nucleic acids
(b) Proteins
(c) Polysaccharides
(d) Lipids
Show Answer & Explanation

Answer: (d) Lipids

Explanation:
1. – Nucleic acids are polymers of nucleotides – Proteins are polymers of amino acids – Polysaccharides are polymers of monosaccharides – Lipids are the esters of fatty acids and alcohol.

Question 3: A non-proteinaceous enzyme is
(a) Lysozyme
(b) Ribozyme
(c) Ligase
(d) Deoxyribonuclease
Show Answer & Explanation

Answer: (b) Ribozyme

Explanation:
1. Ribozyme is RNA acting like an enzyme or biocatalyst.

Question 4: Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
(a) Hydrogen bonds
(b) Electrostatic interaction
(c) Hydrophobic interaction
(d) Ester bonds
Show Answer & Explanation

Answer: (d) Ester bonds

Explanation:
1. Ester bond is formed between sugar and phosphate in a nucleotide.

Question 5: A typical fat molecule is made up of
(a) Three glycerol and three fatty acid molecules
(b) Three glycerol molecules and one fatty acid molecule
(c) One glycerol and three fatty acid molecules
(d) One glycerol and one fatty acid molecule
Show Answer & Explanation

Answer: (c) One glycerol and three fatty acid molecules

Explanation:
1. A typical fat molecule is triglyceride formed by esterification of one glycerol and three fatty acid molecules.

Question 6: Which one of the following statements is wrong?
(a) Glycine is a sulphur containing amino acid
(b) Sucrose is a disaccharide
(c) Cellulose is a polysaccharide
(d) Uracil is a pyrimidine
Show Answer & Explanation

Answer: (a) Glycine is a sulphur containing amino acid

Explanation:
1. Glycine is simplest amino acid in which 'R' is replaced by H(Hydrogen).

Question 7: Which of the following biomolecules does have a phosphodiester bond?
(a) Nucleic acids in a nucleotide
(b) Fatty acids in a diglyceride
(c) Monosaccharides in a polysaccharide
(d) Amino acids in a polypeptide
Show Answer & Explanation

Answer: (a) Nucleic acids in a nucleotide

Explanation:
1. Phosphodiester bond is formed between two nucleotides of nucleic acid.

Question 8: The chitinous exoskeleton of arthropods is formed by the polymerisation of
(a) Lipoglycans
(b) Keratin sulphate and chondroitin sulphate
(c) D-glucosamine
(d) N-acetyl glucosamine
Show Answer & Explanation

Answer: (d) N-acetyl glucosamine

Explanation:
1. Exoskeleton of arthropods is made up of chitin.
2. Chitin is a polymer of N-acetyl glucosamine.

Question 9: Which one of the following is not applicable to RNA?
(a) Chargaff's rule
(b) Complementary base pairing
(c) 5' phosphoryl and 3' hydroxyl ends
(d) Heterocyclic nitrogenous bases
Show Answer & Explanation

Answer: (a) Chargaff's rule

Explanation:
1. Chargaff's rule is applicable only for DNA.

Question 10: In sea urchin DNA, which is double stranded 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are
(a) G 8.5%, A 50%, T 24.5%
(b) G 34%, A 24.5%, T 24.5%
(c) G 17%, A 16.5%, T 32.5%
(d) G 17%, A 33%, T 33%
Show Answer & Explanation

Answer: (d) G 17%, A 33%, T 33%

Explanation:
1. This option, G 17%, A 33%, T 33%, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 11: Select the option which is not correct with respect to enzyme action:
(a) Substrate binds with enzyme at its active site
(b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate
(c) A non - competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate
(d) Malonate is a competitive inhibitor of succinic dehydrogenase
Show Answer & Explanation

Answer: (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate

Explanation:
1. Inhibition of succinic dehydrogenase by malonate is an example of competitive inhibition.
2. This is reversible reaction.
3. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and Vmax remain same.

Question 12: Which one of the following is a non - reducing carbohydrate?
(a) Maltose
(b) Sucrose
(c) Lactose
(d) Ribose 5-phosphate
Show Answer & Explanation

Answer: (b) Sucrose

Explanation:
1. Lactose, Maltose, Ribose 5-phosphate all are reducing sugars.

Question 13: A phosphoglyceride is always made up of:
(a) Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(b) A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(c) A saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
(d) Only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
Show Answer & Explanation

Answer: (b) A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

Explanation:
1. This option, A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 14: The essential chemical components of many coenzymes are:
(a) Nucleic acids
(b) Carbohydrates
(c) Vitamins
(d) Proteins
Show Answer & Explanation

Answer: (c) Vitamins

Explanation:
1. This option, Vitamins, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 15: Transition state structure of the substrate formed during an enzymatic reaction is :
(a) Permanent but unstable
(b) Transient and unstable
(c) Permanent and stable
(d) Transient but stable
Show Answer & Explanation

Answer: (b) Transient and unstable

Explanation:
1. This option, Transient and unstable, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 16: Macromolecule chitin is
(a) Phosphorus containing polysaccharide
(b) Sulphur containing polysaccharide
(c) Simple polysaccharide
(d) Nitrogen containing polysaccharide
Show Answer & Explanation

Answer: (d) Nitrogen containing polysaccharide

Explanation:
1. This option, Nitrogen containing polysaccharide, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 17: For its activity, carboxypeptidase requires
(a) Copper
(b) Zinc
(c) Iron
(d) Niacin
Show Answer & Explanation

Answer: (b) Zinc

Explanation:
1. Carboxypeptidase require Zn2+ metal ion.

Question 18: Which one of the following biomolecules is correctly characterised?
(a) Alanine amino acid – Contains an amino group and an acidic group anywhere in the molecule
(b) Lecithin – a phosphorylated glyceride found in cell membrane
(c) Palmitic acid – an unsaturated fatty acid with 18 carbon atoms
(d) Adenylic acid – adenosine with a glucose phosphate molecule
Show Answer & Explanation

Answer: (b) Lecithin – a phosphorylated glyceride found in cell membrane

Explanation:
1. Option (1) is wrong, because alanine contains an amino group and an acidic group at α-carbon in the molecule.
2. Option (3) is wrong, because palmitic acid is a saturated fatty acid with 16C atoms.
3. Option (4) is wrong, because adenylic acid is form by adding phosphate group to adenosine.

Question 19: Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
(a) Enzymes require optimum pH for maximal activity
(b) Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80°-90°C
(c) Enzymes are highly specific
(d) Most enzymes are proteins but some are lipids
Show Answer & Explanation

Answer: (d) Most enzymes are proteins but some are lipids

Explanation:
1. This is so because most enzymes are protein but some are RNA i.e.
2. Ribonuclease-P and ribozyme.

Question 20: Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (a - e) make it useful as a storage material?<br />a. Easily translocated b. Chemical non-reactive<br />c. Easily digested by animals d. Osmotically inactive<br />e. Synthesized during photosynthesis The useful properties are
(a) Both a & e
(b) Both b & c
(c) Both b & d
(d) a, c & e
Show Answer & Explanation

Answer: (c) Both b & d

Explanation:
1. Carbohydrates like glycogen and starch are relatively easy to store because of the following advantages. . They are stored in bulk. . They are chemically non-reactive. . They are osmotically inactive.

Question 21: An organic substance bound to an enzyme and essential for its activity is called
(a) Coenzyme
(b) Holoenzyme
(c) Apoenzyme
(d) Isoenzyme
Show Answer & Explanation

Answer: (a) Coenzyme

Explanation:
1. Organic compound which bound to an enzyme is either coenzyme or prosthetic group.

Question 22: Telomerase is an enzyme which is a :
(a) Repetitive DNA
(b) RNA
(c) Simple protein
(d) Ribonucleoprotein
Show Answer & Explanation

Answer: (d) Ribonucleoprotein

Explanation:
1. This option, Ribonucleoprotein, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 23: Which of the following is the simplest amino acid?
(a) Tyrosine
(b) Asparagine
(c) Glycine
(d) Alanine
Show Answer & Explanation

Answer: (c) Glycine

Explanation:
1. This is so because in glycine, the R-group is replaced by hydrogen.
2. H HOOC C NH2 H = R group.

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Multiple Choice Questions (MCQs) for NEET Biology Biomolecules

NEET Biology Biomolecules Objective Test Questions

Review structured objective questions for NEET Biology Biomolecules. Built according to official NEET guidelines, these MCQ sets support daily revision and core concept reinforcement.

NCERT-Aligned Objective Questions and Solutions

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