Which carbon compound enters to the Krebs Cycle?
- A. Citric acid
- B. Pyruvic acid
- C. Acetyl coenzyme A
- D. Oxaloacetic acid
Answer: C. Acetyl coenzyme A
The three-carbon pyruvic acid molecules are converted in to a two-carbon molecule attached to Coenzyme A, which is called as acetyl CoA, via the process of pyruvate oxidation. Acetyl-CoA is the key carbon compound that enters the Krebs cycle, triggering the series of reactions that produce energy and other essential molecules.