Which of the following molecules can move across the phospholipid bilayer by simple diffusion?
A) lipids
B) steroids
C) water
D) lipids and water
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

All of the choices listed (lipids, steroids, and water) can move across the phospholipid bilayer by simple diffusion. Lipids and steroids, being nonpolar molecules, easily pass through the hydrophobic core of the membrane. Water, although polar, can move through via simple diffusion in small amounts due to its small size and the presence of aquaporins that facilitate its movement.

Which of the Following Molecules Can Move Across the Phospholipid