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

The complex II of mitochondrial electron transport chain is also known as

1. Cytochrome bc1

2. Succinate dehydrogenase

3. Cytochrome c oxidase

4. NADH dehydrogenase

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Answer: 2. Succinate dehydrogenase

Key idea: Complex II of the electron transport chain is succinate dehydrogenase.

It is the Krebs cycle enzyme embedded in the inner mitochondrial membrane. It oxidises succinate to fumarate and passes electrons through FAD/FADH₂ to ubiquinone.

Complex I: NADH dehydrogenase
Complex III: cytochrome bc₁
Complex IV: cytochrome c oxidase

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

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The complex II of mitochondrial electron transport chain is also known as

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