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The cell membrane fatty acid composition will not change between season.
Which of the are following are most likely to diffuse by the cell membrane?
Phospholipids are made up of a single phosphate molecule that is often attached to the polar head group that defines the lipid group as well as a glycerol molecule bound to two lipid tails. These molecules have hydrophilic heads on a hydrophobic body.
It is likely that CO2 travels across the lipid bilayer far more quickly than any other molecule of these. Since CO2 only consists of three relatively tiny atoms and lacks a dipole moment, it is naturally predisposed to pass through the membrane quickly. There is no charge separation and a linear geometry since the two oxygens are joined by a double bond. The other compounds described are either significantly larger or both.
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