alleryStart learning →What does the plasma membrane control?
AThe rate of DNA replication inside
BWhich molecules move into and out
CThe number of ribosomes assembled
DThe pH of every internal organelle
Answer & Solution
Correct answer: B. Which molecules move into and out
1. The plasma membrane forms the boundary between the cell and its surroundings.
2. It decides which organic molecules, ions, water and oxygen move into and out of the cell.
3. Wastes such as carbon dioxide and ammonia also leave by passing through it.
4. Its job is therefore traffic control at the boundary, not replication or ribosome assembly.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.3 Eukaryotic Cells_
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