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:-

(1) immunoglobulins

(2) phospholipids

(3) albumins

(4) lymphocytes

(1) B

(2) C

(3) D

(4) E

Which of the following is protein hormones?

1. Insulin

2. Oxytocin

3. Both (1) and (2)

4. None of the above

The function of DNA is:

Which one of the following vitamins contains a metal atom?

1. Riboflavin

2. Vitamin B₁₂

3. Vitamin A

4. Vitamin B₆

Adenosine is an example of:

(1) nucleotide

(2) nucleoside

(3) purine base

(4) pyrimidine base

The incorrect statement among the following is:

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?

1. Thyroxin               

2. Insulin

3. Adrenaline             

4. Estradiol