Which of the following molecules do you think would diffuse across a phospholipid bilayer fastest, assuming that there are no proteins associated with the bilayer. (Hint: keep in mind the nature of the interior of the bilayer). A) H₂O B) NH₄⁺ C) CH₃COO^- D) NH₃ E) Na⁺

Question

Quizplus · Accepted Answer

The molecule with the shortest length and least polar groups will diffuse the fastest across the bilayer. Option D (NH₃) has the shortest length and only one polar group (the nitrogen-containing group), making it the fastest diffusing molecule. The other options either have longer chains or more polar groups, which will hinder their ability to diffuse across the bilayer.

Which of the Following Molecules Do You Think Would Diffuse