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Question

Biology Question on respiration in plants

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

A

Malic acid→ Oxaloacetic acid

B

Succinic acid→ Malic acid

C

Succinyl-CoA→Succinic acid

D

Isocitrate→α-ketoglutaric acid

Answer

Succinyl-CoA→Succinic acid

Explanation

Solution

In the tricarboxylic acid cycle, the conversion of Succinyl-CoA to succinic acid does not involve oxidation but is instead a substrate-level phosphorylation.

In contrast, the conversion of isocitrate to-ketoglutarate and malate to oxaloacetate both involve oxidation reactions.