Multiple choice Kerbs cycle is completed by hydrogenation oxidation nitrification reduction none of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Krebs cycle involves multiple oxidation steps where acetyl-CoA is oxidized to CO2, with NAD+ and FAD being reduced to NADH and FADH2. The cycle completes when the original oxaloacetate is regenerated through a series of oxidation reactions.