NEET Biology question

Sequence of events in Kreb's cycle is

(A)Acetyl Co-A → Citrate → Pyruvate → Oxaloacetic acid ← fumarate ← Malate ← Succinate ← α-ketoglutaralte
(B)Acetyl Co-A → Citric acid → α-ketoglutarate → Succinic acid → Fumaric acid → Malic acid → Oxaloacetic acidCorrect
(C)Acetyl Co-A → Citric acid → Malic acid → Oxaloacetic acid ← Succinic acid ← α-ketoglutaric acid
(D)All are wrong

Answer: (B)

Solution

The correct Krebs cycle sequence runs: acetyl-CoA condenses with oxaloacetate to form citrate, which (via isocitrate) is oxidised and decarboxylated to α-ketoglutarate, then to succinyl-CoA/succinic acid, then oxidised to fumaric acid, hydrated to malic acid, and finally oxidised

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Question ID VK-113291