The cell membrane is made up of a phospholipid bilayer. Therefore diffusion of materials into the cell would require interactions with this bilayer, as well as enough bilayer movement to allow materials to go through them.
Which of the following is LEAST likely to play a role in the likelihood that a molecule will diffuse across the phospholipid bilayer of a cell's plasma membrane?
A. Concentration of the molecule on each side of the membrane.
B. Number of double bonds in the molecule
C. Polarity of the molecule
D. Size of the molecule
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