Question

The overall goal of glycolysis, Krebs' cycle and the electron transport system is the formation of

• A. ATP in small stepwise units
• B. ATP in one large oxidation reaction
• C. Sugars
• D. Nucleic acids

Answer 1

The correct option is A ATP in small stepwise units

Glycolysis involves the breakdown of glucose into two molecules of pyruvate with the net release of 8 ATP.

Kerb's cycle takes place in the mitochondria. One molecule of pyruvate generates 15 ATP by undergoing this cycle. So two molecules will lead to the generation of 30 ATP.

Electron transport system takes place in the mitochondria where one molecule of NADH${}_2$ produces three ATP and one molecule of FADH${}_2$ produces two ATP.

So, the correct answer is option A.