Question

The energy yield from the breakdown of a single molecule of glucose does not depend upon

a. whether some of the energy of the H⁺ gradient is used for work other than ATP production.
b. the supply of carbon dioxide.
c. whether the NADH produced in glycolysis passes its electrons across the mitochondrial membrane to NAD⁺ or FAD.
d. the supply of oxygen.

Answer 1

The correct answer is b. the supply of carbon dioxide.

Step-by-step explanation:

The breakdown of glucose is necessary to produce energy in the form of ATP. One molecule of glucose is converted into 2 molecule of pyruvic acid in the process of glycolysis which does not require CO₂ and creates 2 ATP and 2 NADH.

Then this pyruvate is converted into acetyl Co-A in the matrix of mitochondria and undergoes the Kreb cycle in which CO₂ is produced with 6 NADH, 2ATP and 2 FADH₂. So here also no CO₂ supply is required.

Then the electrons released by NADH and FADH₂ molecules are transferred to O₂ to generate ATP. Therefore glucose is oxidized into CO₂ to produce ATP which means energy yield from the breakdown of a single molecule of glucose does not depend upon the supply of carbon dioxide.