1. Product of Krebs cycle essential for oxidative phosphorylation is _______
(a) NADPH and ATP
(b) Acetyl CoA
(c) CO2 and oxaloacetate
(d) NADH and FADH2
Answer: :: (d)
2. A single molecule of glucose generates _________ molecules of acetyl CoA, which enters the Krebs cycle.
(a) 4
(b) 3
(c) 2
(d) 1
Answer: :: (c)
3. ___________ accepts hydrogen from malate
(a) FAD
(b) NAD
(c) NADP
(d) FMN
Answer: :: (b)
4. Which of the intermediate of the Kreb’s cycle is utilised in the formation of amino acids?
(a) Citric acid
(b) Malic acid
(c) Isocitric acid
(d) 𝛼-ketoglutaric acid
Answer: :: (d)
5. Krebs cycle occurs in aerobic respiration due to
(a) Electron transport chain requires aerobic conditions to operate
(b) Oxygen is a reactant
(c) Oxygen has a catalytic function
(d) All of the above
Answer: :: (a)
6. Acetyl CoA is formed from pyruvate by__________ reaction
(a) Dehydration
(b) Reduction
(c) Oxidative decarboxylation
(d) Dephosphorylation
Answer: :: (c)
7. Which of the following is not formed during the Krebs cycle?
(a) Lactate
(b) Isocitrate
(c) Succinate
(d) Both (a) and (b)
Answer: :: (a)
8. The entry of pyruvate into the TCA cycle is inhibited by the presence of a high cellular concentration of
(a) Pyruvate
(b) NADH
(c) Coenzyme A
(d) AMP
Answer: :: (b)
9. ATP synthesis is powered by
(a) Coenzyme motive force
(b) cAMP
(c) proton gradient
(d) GTP hydrolysis
Answer: :: (c)
10. FAD is reduced in which of the reaction of the Kreb’s cycle?
(a) Isocitrate to oxaloacetate
(b) Succinyl CoA to Succinate
(c) Fumarate to malate
(d) Succinate to fumarate
Answer: :: (d)
