Free Biomolecules (Weekly Quiz: 1) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (1-4) the components of reaction labelled as A, B, C and D are identified correctly?

Options:

	A	B	C	D
(a)	Transition state	Potential energy	Activation energy with out enzyme	Activation energy with enzyme
(b)	Potential energy	Transition state	Activation energy without enzyme	Activation energy with enzyme
(c)	Activation energy with enzyme	Transition state	Activation energy without enzyme	Potential energy
(d)	Potential energy	Transition state	Activation energy with enzyme	Activation energy without enzyme

(a) (b)

(b) (a)

(c) (c)

(d) (d)

Question-2

According to weight percentage, the first three elements in human body are

(a) C > O > N

(b) C > H > O

(c) O > N > C

(d) O > C > H

Question-3

Which one of the following is the most abundant protein in the animals?

(a) Collagen

(b) Haemoglobin

(c) Lectin

(d) Insulin

Question-4

Substrate concentration at which an enzyme attains half of its max. velocity is

(a) Km-constant of enzyme

(b) Half-life of enzyme

(c) Concentration ratio

(d) None of these

Question-5

Enzymes catalysing the linking together of two compounds, for example enzymes which catalyse the joining of C-O, C-S, C-N, P-O, etc., bonds, belongs to the class of

(a) Transferases

(b) Isomerases

(c) Hydrolases

(d) Ligases

Question-6

The primary structure of a protein molecule has

(a) one end

(b) two ends

(c) three ends

(d) no ends.

Question-7

One turn of the helix in a B-form DNA is approximately

(a) 3.4 nm

(b) 0.34 nm

(c) 2nm

(d) 20 nm

Question-8

The introduction of t-DNA into plants involves:

(a) Exposing the plants to cold for a brief period

(b) Altering the pH of the soil, then heat shocking the plants

(c) Allowing the plant roots to stand in water

(d) Infection of the plant by Agrobacterium Tumefaciens

Question-9

"When glucose is degraded to lactic acid in skeletal muscles energy is liberated". Which of the following conclusion is correctly associated with the above statement? enzyme?

(a) It is an anabolic pathway which releases energy.

(b) It is a catabolic pathway which releases energy.

(c) The energy, liberated during this degradation, is trapped and stored in the form of chemical bonds (ADP).

(d) None of the above.

Question-10

Cellulose, the most important constituent of plant cell wall is made of

(a) branched chain of glucose molecules linked by β 1, 4 glycosidic bond in straight chain and α 1,6 glycosidic bond at the site of branching

(b) unbranched chain of glucose molecules linked by α 1, 4 glycosidic bond

(c) unbranched chain of glucose molecules linked by β 1, 4 glycosidic bond

(d) branched chain of glucose molecules linked by α 1, 6 glycosidic bond at the site of branching