Biology Multiple Choice Questions and Answers for Different Competitive Exams

Biochemistry Exam Questions

1. Which of the following mineral element facilitates insulin binding to cell receptor site?
a) Zinc
b) Selenium
c) Copper
d) Chromium

2. Which of the following is a folate analog?
a) Methotrexate
b) Carnosine
c)Azaserine
d)Aniserine

3. Histamine is a potent secretagogue of
a) Amylase by the salivary gland
b)HCI by the stomach
c) Gastrin by the stomach
d)NAHCO3 by the pancreas
Biochemistry Exam Questions - Lecturer in Biochemistry Questions

4. The contraluminal plasma membrane of small intestinal epithelial cells contain
a)Disaccharidases
b)Aminopeptidases
c)GLUT 5
d)Na+/ K+ ATPase

5. Platelet aggregation:
a) is initiated at the site of an injury by conversion of fibrinogen to fibrin
b) is inhibited in uninjured blood vessels by the secretion of prostacyclin by intact vascular endothelium
c) causes morphological changes and a release of the vasodilator serotonine
d)is inhibited by the release of ADP and thromboxane A2

6. The cones of the retina:
a)are responsible for colour vision
b)are much more numerous than rods.
c) have red, blue and green light- sensitive pigments that differ because of small difference in the retinal prosthetic group.
d)do not use transducin in signal transduction

7. The nerve impulse that initiates muscular contraction
a) begins with the binding of acetyl choline to receptors in the sarcoplasmic reticulum
b)causes both the plasma membrane and the transverse tubules to undergo hyperpolariation
c) causes opening of calcium channels which lead to an increase in calcium contreation within the sarcomere
d)prevents sodium entering the sarcomere

8. When a muscle contracts, the
a) transverse tubules shorten, the myofibrils and sarcoplasmic reticulum close together
b)Thin filaments and thick filaments of the sarcomere shorten
c) Light chains dissociate from the heavy chains of myosin
d)H bands and I bands of the sarcomere shorten because the thin filaments and thick filaments side past each other

9. Lysis of a fibrin clot:
a) is an equibrium wwith formation of the clot
b) begins when plasmin binds to the clot
c) requires the hydrolysis of plasminogen into heavy and light chains
d) requires conversion of plasminogen by tissue plasminogen activator

10.ATP concentration is maintained relatively constant during muscle contraction by
 a) increasing the metabolic activity
b)the action of adenylate kinase
c) theaction of creatne phosphokinase
d)all of the above
Learn more: MCQ on Biochemistry
Answers
1. d) Chromium
2. a) Methotrexate
3. b)HCI by the stomach
4. d)Na+/ K+ ATPase
5. d)is inhibited by the release of ADP and thromboxane A2
6. a)are responsible for colour vision
7. c) causes opening of calcium channels which lead to an increase in calcium contreation within the sarcomere
8. d)H bands and I bands of the sarcomere shorten because the thin filaments and thick filaments side past each other
9. d) requires conversion of plasminogen by tissue plasminogen activator
10. d)all of the above                                             (Lecturer in Biochemistry Questions)

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