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Which statement is wrong for Krebs’ cycle?

1. There is one point in the cycle where FAD+ is reduced to FADH2.
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+.

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

Solution

The wrong statement is the one describing the first step incorrectly. In Krebs’ cycle, acetyl-CoA condenses with oxaloacetate to form citrate; pyruvate must first be converted to acetyl-CoA before entering the cycle.

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