Selective Permeability
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Last updated 12:47 AM on 7/8/26
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5 Terms
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Q: What does selectively permeable mean?
A: Some substances cross easily while others cannot.
2
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Q: Which molecules cross membranes most easily?
A: Small, nonpolar, and hydrophobic molecules.
3
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Q: Examples of molecules that diffuse easily?
A: O₂, CO₂, N₂, steroids.
4
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Q: Which molecules cross poorly?
A: Ions, large molecules, and polar molecules.
5
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Q: Why can't ions diffuse through membranes?
A: Their charge is repelled by the hydrophobic core.