In mitochondria, where are the electron transport chain complexes and ATP synthase enzymes localized?
Answer and explanation
Correct answer: B. Inner mitochondrial membrane
- Step 1: Mitochondria are bounded by a smooth outer membrane and an intricately folded inner membrane.
- Step 2: The infoldings of the inner membrane, termed cristae, greatly increase the membrane surface area.
- Step 3: Complexes I through IV of the respiratory chain and the ATP synthase particles are embedded directly within this inner cristae membrane.
Answer
Inner mitochondrial membrane (cristae).
Why not the others: Outer mitochondrial membrane contains porin channels for metabolite diffusion; Aqueous intermembrane space accumulates pumped protons to generate the proton-motive force; Central mitochondrial matrix contains Krebs cycle enzymes, ribosomes, and circular mtDNA.
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