Discussion
Assertion (A): The inner mitochondrial membrane is far more extensively folded than the outer one.
Reason (R): The inner membrane carries the electron transport chain and the ATP synthase.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the purpose. The rate of ATP production is limited by how much membrane is available to carry the respiratory complexes and the ATP synthase, so folding the inner membrane into cristae multiplies that area several times within the same volume. The outer membrane carries no such machinery and needs no such area.
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