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biochemistry MCQs

Practise focused biochemistry questions with marked answers for exam preparation and subject revision.

biochemistry Mcqs
1. Which of the following has a ketogenic effect on livers______________?
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A. Androgen

B. Glucagon

C. Insulin

D. GH

2. Which one of the following human tissues contains the greatest amount of body glycogen ?
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A. Kidney

B. Liver

C. Skeletal muscle

D. Cardiac muscle

3. Inhibition of glycolysis by O2 is known a_____________?
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A. Gluconeogenesis

B. Pasteur effect

C. Hill reaction

D. Muni effect

4. A example of a preventive antioxidant is_______________?
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A. Catalase

B. Superoxide dismutase

C. Tocopherol

D. Urate

5. The main enzyme responsible for activation of xenobiotics in (detoxification)____________?
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A. Cytochrome P-450

B. NADPH cytochrome P-450 reductase

C. Glucuronyl transferase

D. Glutathione S-transferase

6. In TCA, substrate level phospherylation takes place in______________?
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A. Alpha ketoglutrate to succinyl CoA

B. Oxalocetate to citrate

C. Succinate to fumarate

D. Succinyl CoA to Succinate
7. The conversion of glucose 6-P to fructose 6-P is an example of which of the following reactions___________?
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A. Dehydration

B. Aldol cleavage

C. Phosphate transfer

D. Isomerisation
8. Fructose intolerance is to_____________?
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A. Fructose and sucrose

B. Fructose and glucose

C. Fructose only

D. Sucrose only

9. Sites where HMP shunts can occur include_______________?
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A. Lactating mammary gland

B. Liver

C. All of the above

D. WBC

E. Testes

10. Enzymes stored in muscle is________________?
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A. SGPT

B. Alkaline phosphatase

C. CPK

D. SGOT

11. The activity of this plasma enzyme is responsible virtually for all plasma cholesterol esters in humans_______________?
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A. Phospho mevalonate kinase

B. HMG CoA reductase

C. Lecithin cholesterol acyl transferase (LCAT)

D. Pyrophospho mevalonate decarboxylase

12. One molecule of acetyl Co-A gives rise to ________ ATP molecules?
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A. 32

B. 8

C. 12

D. 2

13. The enzyme phosphofructo kinase-1 is strongly activated by_______________?
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A. Fructose 2,6 bis phosphate

B. Citrate

C. Adenosine tri phosphate

D. Cyclic AMP

14. The enzymes that catalyses the same reaction but differ in physical properties are called as_____________?
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A. Pro enzyme

B. Co-enzyme

C. Iso enzyme

D. Holoenzyme

15. A relatively component of the electron transporting respiratory chain is_____________?
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A. Flavoprotein

B. Cytochrome A

C. Ubiquinone

D. Cytochrome Cl

16. Ubiqultin is involved in_____________?
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A. Intracellular proteolysis

B. Electron transport chain

C. Transport of ATP

D. Protein folding

17. Oligosaccharide is________________?
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A. Dextrin

B. Maltose

C. Gructose

D. Glucose

18. Competitive enzyme inhibition will cause_____________?
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A. Decrease of km and increase of Vmax

B. Decrease of km and decrease of Vmax

C. Increase of km and Unchanged of Vmax

D. increase of km and increase of Vmax

19. The end product of glycolysis under anaerobic conditions is_______________?
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A. Pyruvic acid

B. Acetoacetic acid

C. Oxaloacetic acid

D. Lactic acid
20. All of the following are substrates for gluconeogenesis except_______________?
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A. Oleic acid

B. Alanine

C. Glycerol

D. Tryptophan