aerobic RESPIRATION numbers

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DOES NADH RESULT IN 2.5 OR 3 ATP, ALSO IS THE YEILD OF NADH AND FADH2 3:1 OR 3:2?
THX

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In Cliff's, it states that NADH results in 3 ATP molecules while FADH2 results in 2 ATP molecules, but in my biochemistry class we learned it as 2.5 ATPs for NADH and 1.5 for FADH2. I guess the value varies from source to source. I think as long as you know that NADH is a higher energy-rich molecule than FADH2, the specific numbers should not matter in the long run.

Aerobic respiration during the Kreb's Cycle makes 3 NADH, 1 FADH2, and 1 ATP from one acetyl CoA.
 
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