Question

which among a - d is true regarding the tca cycle (krebs cycle)? acetyl - coa is the end product of the cycle two turns of the tca cycle occur per mole of glucose catabolized carbon dioxide is used as a reactant during the cycle energy capture is solely by substrate level phosphorylation none of a - d is true

Explanation:

1. Acetyl - CoA: Acetyl - CoA enters the TCA cycle, not a product of it.
2. Energy capture: Energy capture in TCA cycle involves oxidative phosphorylation along with substrate - level phosphorylation.
3. Carbon dioxide: Carbon dioxide is a product of the TCA cycle, not a reactant.
4. Number of turns: One mole of glucose generates two moles of pyruvate, and each pyruvate is converted to acetyl - CoA, resulting in two turns of the TCA cycle per mole of glucose catabolized.

Answer:

D. two turns of the TCA cycle occur per mole of glucose catabolized