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Question


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

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

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'.

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