Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
A) CO2
B) an amino acid
C) glucose
D) K+
E) starch

Question

Quizplus · Accepted Answer

CO2 is a small, nonpolar molecule that can pass through the lipid bilayer of a plasma membrane via simple diffusion. Amino acids and glucose are larger and have polar or charged groups, making them less able to move through the nonpolar interior of the membrane. K+ is a charged ion and would require a transport protein to move through the membrane. Starch is a large, complex carbohydrate and cannot pass through the membrane at all.

Which of the Following Would Likely Move Through the Lipid