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Topic: TCA cycle and electron transport system, ATP yield· Plant Physiology

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

1. Isocitrate \(\rightarrow\) \(\alpha\)-ketoglutaric acid

2. Malic acid \(\rightarrow\) Oxaloacetic acid

3. Succinic acid \(\rightarrow\) Malic acid

4. Succinyl-CoA \(\rightarrow\) Succinic acid

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Answer: 4. Succinyl-CoA \(\rightarrow\) Succinic acid

Key idea: oxidation steps in the TCA cycle produce NADH or \(FADH_2\).

Isocitrate to \(\alpha\)-ketoglutarate (NADH) and malate to oxaloacetate (NADH) are oxidations. Succinate to malate includes the oxidation of succinate to fumarate (\(FADH_2\)). Succinyl-CoA to succinate is substrate-level phosphorylation (GTP is made) and involves no oxidation of the substrate.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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