Which of the following statements concerning cell membranes is/are correct?
1)Bilayers are oriented head to tail.
2)Cholesterol in animal cell membranes provides greater rigidity.
3)Small polar molecules can readily cross a cell membrane by passive diffusion.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1 and 3

Question

Quizplus · Accepted Answer

Cholesterol in animal cell membranes provides greater rigidity by stabilizing the membrane structure. Bilayers are oriented head to head, not head to tail, and small polar molecules typically cannot readily cross the cell membrane by passive diffusion due to the hydrophobic core.

Which of the Following Statements Concerning Cell Membranes Is/are Correct