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Part A What molecule would move through a biological membrane most rapidly by direct diffusion, and why? messenger RNA, becau
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Answer: Carbon dioxide, because it is small and non-polar

Explanation: The molecules such as O2 and CO2 are non-polar and quite small. They have the ability to readily dissolve in the lipid bilayers, therefore they happen to rapidly diffuse through the membrane. The lipid bilayers allow small and uncharged particles (including water and lipids) to easily diffuse through them by simple diffusion. All the other options for this question have mention of either large molecules or polar, hence they are not correct.

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