AP BIOLOGY

Detailed explanation-1: -The three-carbon pyruvic acid molecules are converted to a two-carbon molecule attached to Coenzyme A, called acetyl CoA, via the process of pyruvate oxidation. It is the product, acetyl CoA, which enters the Krebs cycle.

Detailed explanation-2: -Krebs cycle products This process yields 2 acetyl-CoA molecules to be fed into the cycle. Thus, the cycle proceeds twice per original glucose, yielding twice the products shown below.

Detailed explanation-3: -Acetyl CoA transfers its acetyl group to oxaloacetate to form citrate and begin the citric acid cycle.

Detailed explanation-4: -Similarly, proteins can be broken down into their basic parts to form acetyl CoA, the molecule that enters the citric acid cycle.

Detailed explanation-5: -Pyruvate-three carbons-is converted to acetyl CoA, a two-carbon molecule attached to coenzyme A.