Which of the following molecules would not readily cross an intact cell membrane by simple diffusion?
A)water
B)glucose
C)oxygen
D)fatty acids
E)ethanol

Question

Quizplus · Accepted Answer

Water, oxygen, fatty acids, and ethanol are small and non-polar enough to pass through the hydrophobic part of the cell membrane by simple diffusion. Glucose, on the other hand, is a larger molecule and polar, making it difficult to pass through the hydrophobic region of the membrane without aid from transport proteins.

Which of the Following Molecules Would Not Readily Cross an Intact