Biomolecules (Biology)

Question 1

Match List-I with List-II. Choose the correct answer from the options given below: A. Starch B. Antibody C. Concanavalin A D. Glut-4 I. Fights infection II. Energy storage III. Glucose transport IV. Lectin

Accepted Answer

A-II, B-I, C-IV, D-III. Starch is the plant storage polysaccharide, so its role is energy storage. Antibodies are the immunoglobulins that fight infection. Concanavalin A is the classic example of a lectin, a sugar-binding protein. Glut-4 is the transporter that lets glucose enter cells.

Answer

A-I, B-II, C-IV, D-III

Answer

A-II, B-I, C-III, D-IV

Answer

A-I, B-II, C-III, D-IV

Question 2

Arrange the following elements in descending order of their contribution to percentage weight of the human body. Choose the correct answer from the options given below: (a) Oxygen (b) Carbon (c) Hydrogen (d) Nitrogen.

Accepted Answer

(a), (b), (c), (d). By weight the body is about 65% oxygen, 18.5% carbon, 9.5% hydrogen and 3.3% nitrogen. Oxygen dominates because so much of the body is water, and hydrogen ranks below carbon by MASS despite there being more hydrogen atoms, since each weighs so little.

Answer

(c), (a), (b), (d)

Answer

(b), (c), (d), (a)

Answer

(b), (a), (c), (d)

Question 3

Name the class of enzyme that usually catalyses the following reaction: S–G + S# → S + S#–G, where G is a group other than hydrogen, S is a substrate and S# is another substrate.

Accepted Answer

Transferase. The reaction moves a chemical group G from one substrate to another without breaking the molecule with water and without forming a new bond at the expense of ATP. Transfer of a group between two substrates is precisely the definition of a transferase. Hydrolases cleave bonds using water, lyases remove groups leaving double bonds, and ligases join two molecules using ATP.

Answer

Hydrolase

Answer

Lyase

Answer

Ligase

Q1.Match List-I with List-II. Choose the correct answer from the options given below:

Q2.Arrange the following elements in descending order of their contribution to percentage weight of the human body. Choose the correct answer from the options given below:

Q3.Name the class of enzyme that usually catalyses the following reaction: S–G + S# → S + S#–G, where G is a group other than hydrogen, S is a substrate and S# is another substrate.