AP BIOLOGY

Detailed explanation-1: -In one turn of the Krebs cycle, 3 molecules of NADH are produced. For complete oxidation of a glucose molecule, Krebs cycle yields 4 CO2, 6NADH, 2 FADH2 and 2 ATPs.

Detailed explanation-2: -For one cycle, two molecules of carbon, three molecules of NADH, one molecule of FADH2 and one molecule of ATP or GTP are produced.

Detailed explanation-3: -Overview of the Krebs or citric acid cycle, which is a series of reactions that takes in acetyl CoA and produces carbon dioxide, NADH, FADH2, and ATP or GTP.

Detailed explanation-4: -FADH2 and NADH are created from FAD and NAD+ through reduction-oxidation reactions in the Krebs cycle during respiration as seen below: This cycle gives off small amounts of energy in the form of adenosine triphosphate, or ATP, and produces these compounds, FADH2 and NADH.

Detailed explanation-5: -One round of the Krebs cycle will produce one ATP (in the form of the equivalent GTP) through substrate-level phosphorylation, three NADH electron carriers through redox reactions, and one FADH2 electron carrier also through redox reactions. All of the options given above are products of the Krebs cycle.