What Factor Makes the Outer Mitochondrial Membrane Permeable to Protons

Question

What factor makes the outer mitochondrial membrane permeable to protons?
A) proton symports
B) proton antiports
C) porins
D) the presence of proton ionophores
E) the presence of negatively charged lipids

Accepted Answer

The outer mitochondrial membrane is permeable to protons due to the presence of porins, which are large protein channels that allow the passage of molecules up to a certain size.