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Answer:
A. CO2
Explanation:
The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
For instance, when the fresh oxygen molecules in your lungs come into contact with your red blood cells, they diffuse rapidly across your red blood cell membranes into the cells, or down their concentration gradient.
Carbon dioxide can move through the lipid bilayer of a plasma membrane most rapidly.
• Generally, the smaller the molecule and the more soluble it is in oil, that is, nonpolar and the more hydrophobic, the more briskly it will diffuse across a lipid bilayer.
• The small nonpolar molecules like carbon dioxide dissolve easily in lipid bilayers, and thus diffuse briskly through them.
• The small uncharged polar molecules like urea or water, also diffuse across a bilayer, however, much more slowly.
• The lipid bilayers, are highly impermeable to ions or charged molecules, no matter how small.
Thus, carbon dioxide can move through the lipid bilayer of a plasma membrane most rapidly.
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