Question

The first reaction in the citric acid cycle is binding

• A. carbon dioxide to a four-carbon (C4) molecule
• B. carbon dioxide to a five-carbon (C5) molecule
• C. acetyl-CoA to a C4 molecule
• D. acetyl-CoA to a C5 molecule

Answer 1

The correct option is C

acetyl-CoA to a C4 molecule

In first step of citric acid cycle acetyl CoA combines with oxaloacetate (4 carbon) to yield citrate (6 carbon) in presence of enzyme citrate synthase.