本题目来源于试卷: Form and Function B.3 Membranes & Membrane Transport，类别为 IB生物学
[单选题]
Which of the following is ng 9tup54ykvc+nr/ ub-ot a function of1ug1 ai-;f;r +qd79fuvzef qe cholesterol in cell membranes?
A. It reduces membrane fluidity by restricting the movement of phospholipids.
B. It increases membrane flexibility.
C. It serves as a transport channel.
D. It reduces membrane's the permeability to hydrophilic substances.
参考答案: C
本题详细解析:
Cholesterol is a steroid, not a transport channel. Reducing membrane fluidity (Choice A), increasing membrane flexibility (Choice B), and reducing permeability to hydrophilic substances (Choice D) are all roles of cholesterol in cell membranes.
| 
