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

Which statement is wrong for Krebs' cycle ?

1. There is one point in the cycle where \(FAD^+\) is reduced to \(FADH_2\)

2. During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised

3. The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

4. There are three points in the cycle where \(NAD^+\) is reduced to \(NADH + H^+\)

1 answer

Best answer

Answer: 3. The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

The wrong statement is option 3. The cycle begins when acetyl CoA condenses with oxaloacetic acid (not pyruvic acid) to form citric acid.

The other statements are right: one \(FAD^+\) reduction (succinate to fumarate), GTP made at succinyl CoA to succinate, and three \(NAD^+\) reductions.

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