In a hydrogen ion pump, the energy is used to join small molecules together to make larger ones. Which factor most likely has the greatest effect on the
number of molecules mitochondria can produce?
A. The speed of the H+ ions
B. The shape of the protein channel
C. The size of the enzymes on the membrane
D. The size and shape of the cell nucleus

i think the correct answer is B considering that the channels are not always open for the protons to freely diffuse through the inner membrane.

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"a.) well–developed vascular system."