Question

In cellular respiration, as a result of the electron transport chain, a proton gradient is established. Where in the cell are the protons concentrated?

In the intermembrane space, between the inner and outer membranes of the mitochondrion

Between the outer membranes of the mitochondrion and the plasma membrane

Between the plasma membrane and the cell wall

Between the plasma membrane and the extracellular matrix

In the inner membrane of the mitochondrion

Answer 1

Ans) The protons are concentrated in the intermembrane space i.e, between inner and outer mitochondrial membrane.

EXPLANATION:

In oxidative phopshorylation of cellular respiration, protons are pumped out of the mitochondrial matrix into the intermembrane space. This results in electrochemical gradient formation across the inner mitochondrial membrane. When protons in the inter membrane space flow down back to the matrix by ATP synthase present in the inner membrane, energy is released and is utilized to form ATP.