Which of the following statements about enzymes is incorrect?

(1) The catalytic action of an enzyme is not specific

(2) An enzymatic reaction is highly sensitive to temperature

(3) The catalytic action of enzymes is due to their capacity to lower the energy of activation of a particular reaction

(4) None of the above

An antigen develops antibodies which protect the body from their harmful effects. The antibodies
are:-

(a) immunoglobulins

(b) phospholipids

(c) albumins

(d) lymphocytes

Deficiency of which Vitamin develops impotencey:

(a) B

(b) C

(c) D

(d) E

Which of the following is protein hormones?

(a) Insulin

(b) Oxytocin

(c) Both (a) and (b)

(d) None of the above

The function of DNA is:

(1) To synthesize RNA

(2) To synthesize the necessary proteins

(3) To carry the hereditary characteristics from generation to generation

(4) all are correct

Which one of the following vitamins contains a metal atom?
(a) Riboflavin
(b) Vitamin B₁₂
(c) Vitamin A
(d) Vitamin B₆

Adenosine is an example of:

(1) Nucleotide

(2) Nucleoside

(3) Purine base

(4) Pyrimidine base

Which of the following statements is not correct?
(a) Insulin maintains sugar level in the blood of a human body
(b) Ovalbumin is a simple food reserve in egg white
(c) Blood proteins thrombin and fibrinogen are involved in blood clotting
(d) Denaturation makes the proteins more active

In a protein molecule, various amino acids are linked together by

(1) b-glycosidic bond

(2) Peptide bond

(3) Dative bond

(4) a-glycosidic bond

Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?

(a) Thyroxin                (b) Insulin

(c) Adrenaline             (d) Estradiol