CSIR Biochemistry MCQ question part -1

1. The pH of the blood is maintained by
(a) mineral salts (b) globulins
(c) albumins (d) haemoglobin

2. A protein having both structural and enzymatic traits is
(a) actin (b) haemoglobin
(c) myosin (d) myoglobin

3. Potassium cyanide stops cell activity by
(a) preventing diffusion of O2
(b) blocking trachea
(c) preventing transfer of electrons from cytochrome a3 to O2
(d) coagulating protein carriers

4. Successful Replication of chromosomes does not require the presence of
(a) Ribosomes (b) DNA Template
(c) Nuclear enzymes (d) ATP

5. In a diluted starch solution, a-salivary amylase is added at pH 1.6 and kept at 35°C for
half an hour and then Iodine solution is added. What would be the result?
(a) no black colour will appear
(b) black colour will appear
(c) solution will be clear and colourless
(d) solution will be sweet

6. An amino acid devoid of a free-COOH group can be an
(a) Amine (b) Amide
(c) Imine (d) Purine

7. The most striking example of an unique point mutation is found in a disease called
(a) Night blindness (b) Thalassemia
(c) Down syndrome (d) Sickle cell anaemia

8. For the formation of one molecule of hexose sugar, how many turns of Calvin cycle
are needed ?
(a) Six (b) One
(c) Thirty-six (d) One-sixth

9. The hormone that controls pulse rate and blood pressure is
(a) vasopressin (b) oxytocin
(c) adrenalin (d) thyroxine

10. The maximum number of Hydrogen bonds in which water molecule can participate
(a) 1 (b) 2
(c) 3 (d) 4

Check Your Answer