CELL RESPIRATION
THE KREBS CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2 Acetyl CoA
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2 ATP
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2 FADH2
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6 NADH
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Detailed explanation-1: -Acetyl-CoA, a significant carbon input into the citric acid cycle, can be derived from glucose or fatty acids; however, a substantial portion of acetyl-CoA comes from glucose or more specifically, pyruvate. The pyruvate dehydrogenase complex (PDC) facilitates the enzymatic conversion of pyruvate to acetyl-CoA.
Detailed explanation-2: -Thus, for each acetyl-CoA entering the cycle, two carbon dioxide molecules are formed. Two acetyl-CoA molecules enter the cycle, and each has two carbon atoms, so four carbon dioxide molecules will form.
Detailed explanation-3: -A 6-carbon glucose molecule is split into two 3-carbon molecules called pyruvates. Pyruvate is needed in order to create acetyl CoA.
Detailed explanation-4: -Two molecules of acetyl-CoA are produced from each glucose molecule so two turns of the Krebs cycle are required which yields four CO2, six NADH, two FADH2 and two ATPs.