Question

Complete oxidation of one molecule of glucose requires

• A. 3 turns of Kreb’s cycle
• B. 2 turns of Kreb’s cycle
• C. 5 turns of Kreb’s cycle
• D. 1 turn of Kreb’s cycle

Answer 1

The correct option is B 2 turns of Kreb’s cycle

One complete turn of Kreb's cycle requires one molecule of acetyl CoA. One molecule of acetyl CoA comes from one molecule of pyruvate.

In glycolysis, one molecule of glucose generates two molecules of pyruvate. Two molecules of pyruvate require two turns of Kreb's cycle for complete oxidation.

So, complete oxidation of one molecule of glucose requires 2 turns of Kreb's cycle.