First slide

The Respiratory Balance Sheet

Question

What is the net gain of ATP molecules for the complete aerobic breakdown of a molecule of glucose?

Easy

A

40
B

34
C

36
D

38

Solution

During aerobic breakdown of a molecule of Glucose, the number of ATP formed in various stages of respiration is
Glycolsis : Formation : 4 ATP
Usage : 2 ATP
Net gain : 2 ATP
Krebs cycle : 2 ATP
Oxidative phosphorylation due to electron transport system : 34 ATP (oxidation of 10 NADH and 2 FADH₂)
Net gain = 2 ATP + 2 ATP + 34 ATP = 38 ATP

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