alleryStart learning →Where does chemiosmosis take place in a prokaryotic cell, which has no mitochondria?
AIn the cell wall matrix
BIn the nuclear envelope
CIn the ribosomal subunits
DIn the plasma membrane
Answer & Solution
Correct answer: D. In the plasma membrane
1. Chemiosmosis needs a membrane across which protons can be pumped.
2. In a eukaryotic cell that membrane belongs to the mitochondria.
3. A prokaryotic cell has no mitochondria, so the process takes place in the plasma membrane instead.
4. Prokaryotes also have no nuclear envelope, which rules that option out at once.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.1 Energy in Living Systems_
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