AP BIOLOGY

Detailed explanation-1: -So 1 molecule of pyruvate is responsible for the release of 2 CO2 molecules during 1 Krebs cycle. Since 1 glucose molecule gives 2 pyruvate molecules. There will be two cycles to utilize both the pyruvate molecules. Thus, 1 glucose molecule is responsible for the release of 4 CO2 molecules during Krebs cycle.

Detailed explanation-2: -The transition reaction connects glycolysis to the citric acid (Krebs) cycle. The transition reaction converts the two molecules of the 3-carbon pyruvate from glycolysis (and other pathways) into two molecules of the 2-carbon molecule acetyl Coenzyme A (acetyl-CoA) and 2 molecules of carbon dioxide.

Detailed explanation-3: -For one glucose molecules, there will be two rounds of Krebs cycle. This is because two molecules of Pyruvic acid are formed from one molecule of glucose during Glycolysis.

Detailed explanation-4: -Two carbons-from acetyl CoAstart text, C, o, A, end text-enter the citric acid cycle in each turn, and two carbon dioxide molecules are released.

Detailed explanation-5: -Also during the Krebs cycle, the two carbon atoms of acetyl-CoA are released, and each forms a carbon dioxide molecule. Thus, for each acetyl-CoA entering the cycle, two carbon dioxide molecules are formed.