Tca Cycle(Biochemistry ) Questions and answers for exam Preparation

Question 1. How many molecules of ATPs are synthesized per NADH oxidation?

3
4
2
1

Explanation:-

Answer: Option A. -> 3

Question 2. In what form does the product of glycolysis enter the TCA cycle?

NADH
AcetylCoA
Pyruvate
Glucose

Explanation:-

Answer: Option B. -> AcetylCoA

Question 3. Why is the TCA cycle the central pathway of metabolism of the cell?

None of the above
All other metabolic pathways depend upon it
It occurs in the center of the cell
Its intermediates are commonly used by other metabolic reactions

Explanation:-

Answer: Option D. -> Its intermediates are commonly used by other metabolic reactions

Question 4. Malate-asparatate shuttle operates in

heart and liver
lungs and liver
pancreas and liver
none of these

Explanation:-

Answer: Option A. -> heart and liver

Question 5. Oxidation of a molecule involves

loss of proton
loss of electron
gain of electron
gain of proton

Explanation:-

Answer: Option B. -> loss of electron

Question 6. During cellular respiration, most of the ATP made, is generated by

glycolysis
photophosphorylation
substrate-level phosphorylation
oxidative phosphorylation

Explanation:-

Answer: Option D. -> oxidative phosphorylation

Question 7. To stop ATP synthesis which chemical is generally used?

2,4 dinitrophenol
DNSA
None of the chemical can stop ATP synthesis
DDT

Explanation:-

Answer: Option A. -> 2,4 dinitrophenol

Question 8. Citric acid cycle occurs in

mitochondria
endoplasmic reticulum
golgi bodies
cytoplasm

Explanation:-

Answer: Option A. -> mitochondria

Question 9. The enzymes of the TCA cycle in a eukaryotic cell are located in the

mitochondria
plasma membrane
lysosomal bodies
nucleus

Explanation:-

Answer: Option A. -> mitochondria

Question 10. Important function of cholesterol is to

None of these
enhance blood circulation
modulate fluidity
prevent bile salts formation

Explanation:-

Answer: Option C. -> modulate fluidity