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s2008m [1.1K]
3 years ago
12

Which class of molecules can directly cross the cell membrane without the aid of transport proteins? Choose one: A. Ions B. Suga

rs C. Uncharged gasses D. Amino acids
Biology
1 answer:
yulyashka [42]3 years ago
6 0
Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
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