Question

Which statement is wrong for Krebs'cycle?

• A. There are three points in the cycle where NAD+ is reduced to NADH + H+
• B. There is one point in the cycle where FAD+ is reduced to ${\mathrm{FADH}}_2$
• C. During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised
• D. The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

Answer 1

The correct option is D The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid

The Krebs'cycle (TCA cycle) starts with the condensation of acetyl group (acetyl CoA) with oxaloacetic acid (OAA) and water to yield citric acid.

Hence, the statement in option d is wrong.

The cycle reduces three NAD+ to NADH + H+ and one FAD+ to ${\mathrm{FADH}}_2$.

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

Fig: Diagrammatic representation of Krebs'cycle