WB JEE Medical WB JEE Medical Solved Paper-2014

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

A) \[P=2,Q=6,R=30\]

B) \[P=8,Q=6,R=24\]

C) \[P=8,Q=10,\text{ }R=20\]

D) \[P=2,Q=12,\text{ }R=24\]

Correct Answer: B

Solution :

Out of the 38 molecules of ATP produced upon aerobic respiration of glucose. The breakup of ATP during complete aerobic respiration is given below

Glycolysis	2ATP directly	\[=2\,ATP\]
	2 molecules of NADH	\[=6\,ATP\]	Total 8 ATP
Pyruvic acid to acetyl Co-A	2 molecules of NADH	\[=6\,ATP\]
Citric acid cycle	6 molecules of NADH	\[=18\,ATP\]
	2 molecules of FADH	\[4\,ATP\]
	2 molecules of GTP	\[=2\,ATP\]	Total 24 ATP
	Total	38 ATP

Note It is to be noted that in eukaryotic cells, 2 molecules of ATP are spent for transporting 2 molecules of NADH formed during glycolysis (in the cytoplasm) to the mitochondria. Hence, the net gain is 36 molecules of ATP.

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