Question

In aerobic cellular respiration, most of the ATP is synthesized during:

• A. Electron transport
• B. Glycolysis
• C. Krebs cycle
• D. Oxidation of pyruvic acid

Answer 1

The correct option is C Krebs cycle

Cellular respiration occurs in three steps :

1. Glycolysis
2. Krebs cycle
3. Terminal oxidation

Glycolysis is the breakdown of glucose into two molecules of pyruvate where 2 NADH and 2 ATP molecules are formed which in total is 8 ATP molecules as 1 NADH = 3 ATP, While in Krebs cycle reaction occurs in mitochondria where 10 NADH molecules, 2 FADH, and 4 ATP molecules are formed, in total 38 ATP molecules are formed .

So, the correct option is ' Krebs cycle'.