Question

which molecule helps pyruvate cross the mitochondrial membrane?
atp
acetyl coa
fadh2
nadh

Explanation:

Pyruvate is transported across the mitochondrial membrane by a pyruvate - translocase protein. Among the given options, none directly help pyruvate cross the membrane in a direct - carrier sense. However, pyruvate is converted to acetyl - CoA inside the mitochondria after crossing. But this conversion occurs after transport. ATP, FADH2, and NADH are energy - related molecules in cellular respiration but not involved in pyruvate membrane - crossing. There is no correct option here as none of these molecules are the actual transporters, but acetyl - CoA is related to pyruvate metabolism in mitochondria.

Answer:

None of the above options are correct as the actual molecule that helps pyruvate cross the mitochondrial membrane is a pyruvate - translocase protein, not ATP, Acetyl CoA, FADH2, or NADH.