3 NEET previous-year questions on Biomolecules, each with the correct answer and a step-by-step solution. Sourced directly from official NEET papers across every booklet code.
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A-IV, B-II, C-III, D-I
A-III, B-II, C-I, D-IV
A-II, B-IV, C-I, D-III
A-IV, B-I, C-III, D-II
Solution
The correct answer is option (3) as A. Lipase – Digests ester bond found in lipids. B. Nuclease – Helps in digestion of phosphodiester bonds found in nucleic acids. C. Protease – Helps in digestion of peptide bond found in proteins. D. Amylase – Digests/breaks the glycosidic bonds found in carbohydrates i.e., digest starch into smaller molecules, ultimately yielding maltose, which in turn is cleaved into two glucose molecules by maltase.
E, A, D, C, B
A, E, B, D, C
B, A, C, D, E
E, D, C, B, A
Solution
The correct answer is option (1) which is E, A, D, C, B. The catalytic cycle of an enzyme action can be described in the following steps. (1) First, the substrate binds to the active site of the enzyme, fitting into the active site. (2) The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate. (3) The active site of the enzyme, now in close proximity of the substrate breaks the chemical bonds of the substrate and the new enzyme-product complex is formed. (4) The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate and run through the catalytic cycle once again. Options (2), (3) and (4) are incorrect as the steps mentioned are in the wrong sequence.
A-II, B-III, C-I, D-IV
A-III, B-IV, C-II, D-I
A-III, B-II, C-IV, D-I
A-III, B-II, C-I, D-IV
Solution
Adenosine is a nucleoside (III), Adenylic acid is a nucleotide (II), Adenine is a nitrogen base (I), and Alanine is an amino acid (IV).
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