NEET Biology Biomolecules MCQs Set 07

Multiple Choice Questions (MCQs) for NEET Biology: Biomolecules

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

Practice Biomolecules MCQs for NEET Biology

Access the complete set of multiple-choice questions for Biomolecules below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official NEET textbooks.

Multiple Choice Questions

Question 1: Non-protein part of enzyme is known as
(a) Apoenzyme
(b) Cofactor
(c) Inorganic catalyst
(d) Active site
Show Answer & Explanation

Answer: (b) Cofactor

Explanation:
1. Enzyme (Holoenzyme) Protein part Non-protein part (Apozyme) (Cofactor) Organic compound Inorganic It includes metal ions 2+ 2+ Tightly bound Loosely bound i.e., Zn , Mg etc. (Prosthetic group).

Question 2: A cellulose molecule is formed by the polymerisation of glucose. The number of glucose molecules present in a cellulose is
(a) 600
(b) 6000
(c) 60,000
(d) 60
Show Answer & Explanation

Answer: (b) 6000

Explanation:
1. A cellulose molecule is formed by polymerisation of 6000 molecules of β glucose.

Question 3: The structure of protein which gives a three dimensional view is
(a) Primary structure
(b) α-helix
(c) β-pleated sheet
(d) Tertiary structure
Show Answer & Explanation

Answer: (d) Tertiary structure

Explanation:
1. Tertiary structure of protein gives a three dimensional view.

Question 4: The product of the given reaction would be a CH2OH HOOC–R1 CHOH + HOOC–R2 CH2OH HOOC–R3 Glycerol Fatty acid
(a) Monoglyceride
(b) Diglyceride
(c) Triglyceride
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (c) Triglyceride

Explanation:
1. This is so because given structure has three fatty acids.

Question 5: The given fatty acid is known as CH3(CH2)7 CH = CH (CH2)7 COOH
(a) Palmitic acid
(b) Oleic acid
(c) Stearic acid
(d) Arachidonic acid
Show Answer & Explanation

Answer: (b) Oleic acid

Explanation:
1. (CH3)2(CH2)7CH = CH(CH2)7COOH – Oleic acid CH3(CH2)14COOH – Palmitic acid CH3(CH2)16COOH – Stearic acid Arachidonic acid : CH3(CH2)4CH = CHCH2CH = CHCH2CH = CHCH2CH = CH(CH2)3COOH (20 C).

Question 6: Nucleic acids exhibit
(a) Secondary structure
(b) Tertiary structure
(c) Quaternary structure
(d) Both (2) & (3)
Show Answer & Explanation

Answer: (a) Secondary structure

Explanation:
1. This is so because nucleic acid (DNA) has double helical structure and it comes under secondary structure.

Question 7: The backbone of a DNA molecule is made up of
(a) Adenine and guanine
(b) Sugar-phosphate-sugar chain
(c) Cytosine and thymine
(d) All of these
Show Answer & Explanation

Answer: (b) Sugar-phosphate-sugar chain

Explanation:
1. Backbone of a DNA molecule is made up of Sugar – Phosphate – Sugar chain 3' P 5' P = Phosphate S A T S S = Sugar A = Adenine P P T = Thymine G = Guanine S G C S C = Cytosine P P S T A S 5' P 3'.

Question 8: If the sequence of bases in one of the DNA strand is A G G A G A A, then the sequence of bases in the other complementary strand of DNA would be
(a) C C T T C T T
(b) T C T C T C C
(c) T C C T C T T
(d) C C T C T C T
Show Answer & Explanation

Answer: (c) T C C T C T T

Explanation:
1. This is so because a = T, G ≡ C.

Question 9: RNA is a polymer of
(a) Ribonucleotides
(b) Deoxyribonucleotides
(c) Deoxyribonucleosides
(d) Ribonucleosides
Show Answer & Explanation

Answer: (a) Ribonucleotides

Explanation:
1. It is made up of ribose sugar, phosphate and nitrogenous bases (A, U, G, C).

Question 10: t-RNA constitutes about
(a) 70-80% of the total RNA
(b) 15% of the total RNA
(c) 5% of the total RNA
(d) 1-3% of the total RNA
Show Answer & Explanation

Answer: (b) 15% of the total RNA

Explanation:
1. r-RNA → 70 – 80% of total RNA t-RNA → 15% of total RNA m-RNA → 2–5% of total RNA.

Question 11: The given amino acid is _______ in nature. COOH H2N–C–H CH2.COOH
(a) Acidic
(b) Basic
(c) Neutral
(d) Aromatic
Show Answer & Explanation

Answer: (a) Acidic

Explanation:
1. This is so because given structure has an extra carboxylic group.

Question 12: Which of the following are basic amino acids?
(a) Glycine and Alanine
(b) Lysine and Arginine
(c) Glutamic acid and Aspartic acid
(d) Histidine and Proline
Show Answer & Explanation

Answer: (b) Lysine and Arginine

Explanation:
1. Lysine and Arginine → Basic amino acid → +ve charged Glutamic acid and Aspartic acid → Acidic amino acid → –ve charge.

Question 13: In which of the following energy is released?
(a) Conversion of glucose into pyruvate
(b) Formation of proteins from amino acids
(c) Conversion of glucose into lactic acid
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (d) Both (1) & (3)

Explanation:
1. Anaerobic combustion of glucose releases energy in the form of ATP.

Question 14: Adenosine Triphosphate (ATP) liberates high energy by the breakdown of
(a) Glycosidic bond
(b) Hydrogen bond
(c) Phosphate bond
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (c) Phosphate bond

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

Question 15: Which of the following statements is correct?
(a) Biocatalysts accelerate the rate of a given metabolic reaction
(b) Biocatalysts are generally protein
(c) Enzyme catalyst differ from inorganic catalyst
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

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

Question 16: Which of the following statements is incorrect w.r.t. inorganic catalysts?
(a) They do not occur in living cells
(b) They are not specific for any reaction
(c) They get damaged at high temperature
(d) They work efficiently at high pressure
Show Answer & Explanation

Answer: (c) They get damaged at high temperature

Explanation:
1. Inorganic catalyst work efficiently at high temperature and pressure, but enzyme get damaged at high temperature (i.e. above 40ºC) except thermophillic enzyme.

Question 17: Read the following :<br />(a) Low temperature preserves the enzyme<br />(b) Enzyme activity increases above optimum temperature<br />(c) Enzyme gets denatured at high temperature<br />(d) Competitive inhibitor competes with the product formed Which of the following statement are true?
(a) (a) & (c)
(b) (b) & (d)
(c) (c) & (d)
(d) (a) & (b)
Show Answer & Explanation

Answer: (a) (a) & (c)

Explanation:
1. (b) Statement is wrong because enzyme activity decreases above optimum temperature. (d) Statement is wrong because competitive inhibitor completes with substrate for active site, not with product formed.

Question 18: Enzymes catalysing the breakdown of larger molecules into smaller molecules are
(a) Hydrolases
(b) Isomerases
(c) Ligase
(d) Both (1) & (3)
Show Answer & Explanation

Answer: (a) Hydrolases

Explanation:
1. This is so because because, hydrolases are the enzyme which catalyse the breakdown of larger molecules into smaller molecules with the addition of water.
2. Isomerases : They are the enzymes which catalyse the rearrangement of molecular structure to form isomers.
3. Ligases : They help in joining C – O, C – S, C – N etc. bonds by using energy of ATP.

Question 19: Michaelis constant (Km) value of enzyme is substrate concentration at which velocity of reaction is
(a) Vmax
(b) One third Vmax
(c) Half Vmax
(d) One fifth Vmax
Show Answer & Explanation

Answer: (c) Half Vmax

Explanation:
1. Vmax Velocity Vmax of reaction 2 Km [s].

Question 20: _______ catalyses covalent bonding of two substrates.
(a) Invertase
(b) Amylase
(c) Glutamate pyruvate transaminase
(d) PEP carboxylase
Show Answer & Explanation

Answer: (d) PEP carboxylase

Explanation:
1. This is so because this is a ligase enzyme.

Question 21: Study the following statements :<br />(a) The substrate binds to the active site of the enzyme<br />(b) Enzymes isolated from thermophilic organisms get denatured at 50°C<br />(c) The active site of enzyme breaks the chemical bonds of the product<br />(d) Prosthetic groups are tightly bound to the apoenzyme Select the option which includes all correct statements :
(a) (a) & (c)
(b) (c) & (d)
(c) (b) & (c)
(d) (a) & (d)
Show Answer & Explanation

Answer: (d) (a) & (d)

Explanation:
1. (b) Statement is wrong, because thermophillic enzymes don't get denatured at high temperature, they work efficiently at high temperature (750ºC). (c) Statement is wrong, because enzyme don't break chemical bonds of product but of substrate.

Question 22: All enzymes are proteins, except
(a) Trypsin
(b) Pepsin
(c) Steapsin
(d) Ribozyme and Ribonuclease-P
Show Answer & Explanation

Answer: (d) Ribozyme and Ribonuclease-P

Explanation:
1. This is so because because, all enzymes are proteins, except, ribozyme and ribonuclease-P, which are RNA act as enzyme.

Question 23: Cyanide kills an animal by
(a) Killing the brain cells
(b) Competitive inhibitor of enzyme cytochrome oxidise
(c) Inhibiting cytochrome oxidase, a mitochondrial enzyme essential for cellular respiration by Non-competitive inhibition
(d) Killing the cells of cardiac muscles
Show Answer & Explanation

Answer: (c) Inhibiting cytochrome oxidase, a mitochondrial enzyme essential for cellular respiration by Non-competitive inhibition

Explanation:
1. Cyanide poisoining is an example of non competitive inhibition of enzyme.

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Multiple Choice Questions (MCQs) for NEET Biology Biomolecules

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