Biology

A key difference between the inner and outer mitochondrial membranes is that the inner membrane contains enzymes for ATP synthesis, whereas the outer membrane does not.

The inner mitochondrial membrane is highly folded into structures called cristae, which increase its surface area and house the proteins and enzymes involved in the electron transport chain and ATP synthase, essential for ATP production. In contrast, the outer membrane is smoother and contains porins, which make it permeable to small molecules and ions.

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