NEET Biology Biomolecules MCQs Set 16

Biology Objective Questions and Answers: 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.

Download Biomolecules MCQs with Answers

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: GLUT-4 is a protein that
(a) transports glucose into cells
(b) acts as a hormone
(c) forms ground substance
(d) catalyses reactions
Show Answer & Explanation

Answer: (a) transports glucose into cells

Explanation:
1. Insulin is a hormone and collagen is a structural protein.

Teacher's Note:
1. GLUT-4 is a carrier protein.

Question 2: The polysaccharide that is the energy store in plants is
(a) glycogen
(b) cellulose
(c) chitin
(d) starch
Show Answer & Explanation

Answer: (d) starch

Explanation:
1. Starch stores energy in plant tissue, glycogen in animals.

Teacher's Note:
1. Cellulose is structural.

Question 3: Inulin is a polymer of
(a) fructose
(b) glucose
(c) galactose
(d) N-acetyl glucosamine
Show Answer & Explanation

Answer: (a) fructose

Explanation:
1. Inulin is a fructosan.

Teacher's Note:
1. Cellulose and starch are glucose polymers.

Question 4: The exoskeleton of arthropods is made of
(a) cellulose
(b) chitin
(c) keratin
(d) peptidoglycan
Show Answer & Explanation

Answer: (b) chitin

Explanation:
1. Chitin is a polymer of N-acetyl glucosamine, a complex polysaccharide.

Teacher's Note:
1. It is also in fungal cell walls.

Question 5: Adult human haemoglobin has how many polypeptide chains?
(a) Four, two alpha and two beta
(b) Two
(c) Three
(d) Six
Show Answer & Explanation

Answer: (a) Four, two alpha and two beta

Explanation:
1. It has four subunits, a quaternary structure.

Teacher's Note:
1. Each subunit has a haem.

Question 6: In one complete turn of B-DNA, the number of base pairs and the distance per base pair are
(a) 3.4 and 10 angstrom
(b) 10 and 3.4 angstrom
(c) 20 and 3.4 angstrom
(d) 10 and 34 angstrom
Show Answer & Explanation

Answer: (b) 10 and 3.4 angstrom

Explanation:
1. One turn has 10 base pairs with a pitch of 34 angstrom, so each base pair is 3.4 angstrom.

Teacher's Note:
1. Guanine pairs with cytosine through three hydrogen bonds.

Question 7: Nucleic acids that behave like enzymes are called
(a) isozymes
(b) zymogens
(c) apoenzymes
(d) ribozymes
Show Answer & Explanation

Answer: (d) ribozymes

Explanation:
1. Some RNAs have catalytic activity.

Teacher's Note:
1. Almost all other enzymes are proteins.

Question 8: The active site of an enzyme is
(a) a crevice or pocket into which the substrate fits
(b) the whole molecule
(c) a cofactor
(d) always a metal ion
Show Answer & Explanation

Answer: (a) a crevice or pocket into which the substrate fits

Explanation:
1. The active site is a small part of the surface where the substrate binds.

Teacher's Note:
1. The ES complex is obligatory.

Question 9: Enzymes lower the reaction rate barrier by
(a) raising the activation energy
(b) changing the free energy of the reaction
(c) bringing down the activation energy
(d) increasing temperature
Show Answer & Explanation

Answer: (c) bringing down the activation energy

Explanation:
1. Enzymes make the transition from S to P easier.

Teacher's Note:
1. They do not change the overall energy change.

Question 10: Enzymes isolated from thermophiles are important because of
(a) low activity
(b) high cost
(c) thermal stability
(d) low specificity
Show Answer & Explanation

Answer: (c) thermal stability

Explanation:
1. They remain active at high temperatures.

Teacher's Note:
1. Most enzymes get denatured with heat.

Question 11: Enzymes catalysing the linking of two compounds are
(a) lyases
(b) transferases
(c) isomerases
(d) ligases
Show Answer & Explanation

Answer: (d) ligases

Explanation:
1. Ligases join compounds, using ATP.

Teacher's Note:
1. There are six classes of enzymes.

Question 12: Enzymes catalysing interconversion of optical, geometric or positional isomers are
(a) ligases
(b) isomerases
(c) lyases
(d) oxidoreductases
Show Answer & Explanation

Answer: (b) isomerases

Explanation:
1. Isomerases catalyse interconversion of isomers.

Teacher's Note:
1. Transferases move groups other than hydrogen.

Question 13: The prosthetic group in peroxidase and catalase is
(a) haem
(b) zinc
(c) NAD
(d) biotin
Show Answer & Explanation

Answer: (a) haem

Explanation:
1. Haem is tightly bound to the apoenzyme.

Teacher's Note:
1. Zinc is a cofactor for carboxypeptidase.

Question 14: Coenzymes NAD and NADP contain the vitamin
(a) riboflavin
(b) thiamine
(c) biotin
(d) niacin
Show Answer & Explanation

Answer: (d) niacin

Explanation:
1. NAD and NADP contain niacin, a B vitamin.

Teacher's Note:
1. Coenzymes are organic compounds loosely associated with the apoenzyme.

Question 15: In a graph of velocity against substrate concentration, the substrate concentration at which velocity is half of Vmax is
(a) Km
(b) Vmax
(c) Ki
(d) Kcat
Show Answer & Explanation

Answer: (a) Km

Explanation:
1. Km is the Michaelis constant.

Teacher's Note:
1. It indicates affinity of the enzyme for substrate.

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FAQs

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