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19 February, 14:42

Which class of molecules can directly cross the cell membrane without the aid of transport proteins? Choose one: A. Ions B. Sugars C. Uncharged gasses D. Amino acids

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  1. 19 February, 15:37
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    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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