Question:
Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.
Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.
Updated On: Mar 27, 2025
- Malic acid→ Oxaloacetic acid
- Succinic acid→ Malic acid
- Succinyl-CoA→Succinic acid
- Isocitrate→α-ketoglutaric acid
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The Correct Option is C
Solution and Explanation
The reaction Succinyl-CoA → Succinic acid does not involve oxidation. This step is a substrate-level phosphorylation where CoA is removed and the energy is used to form ATP or GTP.
The other reactions, like Isocitrate → α-ketoglutaric acid, involve oxidation as electrons are transferred to NAD+ to form NADH.
Thus, the correct answer is (3) Succinyl-CoA → Succinic acid.
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