During the Krebs cycle and oxidative phosphorylation of cellular respiration?

D

decemberbleu

New member
I) there is a net gain of two ATP per glucose
II) the electron transport chain is uses the energy in NADH and FADH2 to produce up to 34 ATP
III) energy is transferred from glucose and pyruvate to NADH and FADH2

which one(s) are true?
 
I. Definitely NOT correct since NET gain is much much more than two ATPs per glucose.

II. Oxidative Phosphorylation definitely uses the energy in electron carriers from Citric Acid (Krebs cycle) to produce up to 34 ATP.

III. This is correct because energy is stored in the form of glucose, which is broken down by glycolysis to yield pyruvate. Pyruvate is then converted to Acetyl-CoA by Pyruvate dehydrogenase complex and it is acetyl CoA and oxaloacetate combining to from citrate. Citrate goes through the entire cycle reducing NAD and FAD to NADH + H+ and FADH2. The choice given in the question seems to imply that energy is transfered to the already reduced form of those electron carriers which is obviously not true so it depends on how you understand it.
 
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