Question

The TCA cycle starts with the condensation of which of the following compounds?

• A. Sucrose
• B. Acetyl group
• C. Ethanol
• D. Pyruvate

Answer 1

Answer:

B. Acetyl group

• The TCA cycle starts with the condensation of acetyl group.

• It reacts with oxaloacetic acid and water and forms citric acid.

• This reaction is catalysed by the enzyme citrate synthase and a molecule of CoA is released.

• Further, citrate is isomerised to isocitrate with the help of isomerase enzyme.