Where is the electron transport chain located in a eukaryotic cell?
AIn the outer mitochondrial membrane
BIn the inner mitochondrial membrane
CIn the mitochondrial matrix fluid
DIn the cytoplasm around the organelle
Answer & Solution
Correct answer: B. In the inner mitochondrial membrane
1. The chain is built from complexes that must sit inside a membrane to pump protons across it.
2. In eukaryotes it is present in multiple copies in the inner mitochondrial membrane.
3. In prokaryotes the same chain sits in the plasma membrane.
4. The matrix holds the soluble enzymes of the citric acid cycle instead, so it is not the site of the chain.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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