3
The plasma membrane is not
EXPLANATION
Cell Organelles, Cytoskeleton, Membrane Dynam
- Permeability of the Plasma Membrane:
- The plasma membrane consists of an amphipathic phospholipid bilayer with a hydrophobic internal hydrocarbon core.
- Small non-polar molecules ($O_2, CO_2, N_2$) and small uncharged molecules (ethanol) diffuse freely across the bilayer.
- Water is a polar molecule; although trace amounts cross by simple diffusion, water is not freely permeable across pure lipid bilayers and requires specialized transmembrane protein channels (aquaporins) for rapid facilitated osmotic transport.
- Correct Option: Option 2 (freely permeable to water).
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