Mitochondria have:
A) Only a very selective outer membrane
B) An outer membrane, an intermediate membrane, and a very selective inner membrane
C) An outer membrane consisting of a phospholipid monolayer
D) An outer membrane and a very selective inner membrane
E) A very selective membrane in which no proteins are present
IMAT 2024 · Question 20
Q20 - Cellular structures
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The correct answer is D) An outer membrane and a very selective inner membrane.
Mitochondria have two membranes. The outer one is fairly leaky (it has porins), and the inner one is very selective and folded into cristae, where the electron transport chain and ATP synthase sit.
Careful with B: the gap between the membranes is the intermembrane space, not a third membrane.
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