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BotanyNEET 2024Krebs cycle and electron transport chain

Respiration in Plants

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

  1. A.Succinic acid → Malic acid
  2. B.Succinyl-CoA → Succinic acid✓
  3. C.Isocitrate →α\to \alpha-ketoglutaric acid
  4. D.Malic acid → Oxaloacetic acid

Solution

Succinyl-CoA → succinic acid is a substrate-level phosphorylation that releases CoA and makes GTP; no hydrogen is removed. The other three steps are dehydrogenations (oxidations).

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