Which of these molecules is correctly matched with its method of movement through the cell membrane?
A)lipid-soluble molecules - pass through membrane channels
B)small,water-soluble molecules (ions)- dissolve in double phospholipid layer
C)large,water-soluble molecules - transported by carrier-mediated processes
D)glucose and amino acid molecules - pass through membrane channels
E)All of these are correctly paired.

Question

Quizplus · Accepted Answer

Large, water-soluble molecules cannot pass through the lipid bilayer of the cell membrane, so they require carrier-mediated processes such as facilitated diffusion or active transport to move through the membrane. Lipid-soluble molecules can pass through the membrane without any assistance, small water-soluble molecules can dissolve in the phospholipid layer and pass through, and glucose and amino acid molecules require carrier proteins to assist in their transport. Choice C correctly matches large, water-soluble molecules with carrier-mediated processes.

Which of These Molecules Is Correctly Matched with Its Method