Question

# Out of $$38$$ molecules of ATP produced upon aerobic respiration of glucose, the break up in ATP production in glycolysis(P), pyruvate to acetyl-CoA formation(Q) and Krebs cycle(R) is as follows

A
P=2, Q=6, R=30
B
P=8, Q=6, R=24
C
P=8, Q=10, R=20
D
P=2, Q=12, R=24

Solution

## The correct option is A P=$$2$$, Q=$$6$$, R=$$30$$The glucose molecule is broken down to give two molecules of pyruvate. There are 4 ATPs produced but 2 are used up, so the net yield of glycolysis is 2 ATP. The pyruvate molecule is converted to acetyl CoA. One NADH$$_2$$ molecule is produced when one pyruvate is converted to acetyl-CoA which gives 3 ATP. So, 2 molecules of NADH$$_2$$ will give 6 ATP. Krebs cycle also produces eight molecules of NADH$$_2$$ which gives 24 ATP and two molecules of FADH$$_2$$ which gives 2 ATP per molecule of glucose. There are 2 GTP molecule produced which are converted to form 2 ATP. So, there are 30 ATP.Thus, the correct answer is option A. Biology

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