Between glycolysis and the citric acid cycle (also known as theKrebs cycle), the
ID: 3561 • Letter: B
Question
Between glycolysis and the citric acid cycle (also known as theKrebs cycle), there are two molecules of ATP and two molecule ofGTP generated directly. Most of the energy derived from theoxidation of glucose comes from the oxidation of
FADH2generated from the citric acid cycle.
NADPH generatedfrom the citric acid cycle.
NADH generatedfrom the citric acid cycle.
NADH generatedfrom glycolysis.
Between glycolysis and the citric acid cycle (also known as theKrebs cycle), there are two molecules of ATP and two molecule ofGTP generated directly. Most of the energy derived from theoxidation of glucose comes from the oxidation of
FADH2generated from the citric acid cycle.
NADPH generatedfrom the citric acid cycle.
NADH generatedfrom the citric acid cycle.
NADH generatedfrom glycolysis.
Explanation / Answer
This isn't a very well worded question, but if it is asking wheremost of the energy comes from that isn't the ATP made directly fromthe process I would say that it's the NADH from the citric acidcycle. Remember that during glycolysis in the payoff phase you get twomolecules of NADH per glucose and then in the citric acid cycle youpull out 6 more molecules these then go to the electron transportchain where they are oxidized to create NAD+ and ATP. I think this is a poorly worded question though because three ofthe four statements are partially true you just have to selectwhich one pays off the most energy. So when looking at the bigpicture you get 4 ATP from the phosphorylation of FADH2,4 (or six if a certain mechanism is used but that doesn't affectthe answer) ATP from the NADH produced in glycolysis, and 18 fromthe NADH produced in the citric acid cycle. So by far most of your energy comes from the last choice.
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