Question

question 20 of 20
what is the proton gradient in cellular respiration?
o a higher concentration of protons (h+) on one side of a membrane than the other
o the passive transport of electrons across the inner mitochondrial membrane
o the movement of protons (h+) across a selectively permeable (semipermeable) membrane
o the accumulation of atp on one side of the inner mitochondrial membrane

Explanation:

A proton gradient in cellular respiration is defined by a higher concentration of protons ($H^+$) on one side of a membrane (specifically the inner - mitochondrial membrane) compared to the other. This gradient is crucial for ATP synthesis via chemiosmosis. The passive transport of electrons is part of the electron - transport chain, not the definition of a proton gradient. The movement of protons across a membrane is related but not the full definition of the gradient. The accumulation of ATP is a result of using the proton gradient, not the gradient itself.

Answer:

A. a higher concentration of protons ($H^+$) on one side of a membrane than the other