本题目来源于试卷: Form and Function B.1 Carbohydrates & Lipids，类别为 IB生物学
[单选题]
Which of the following is ody yi5ff+, vo39d.j6g wqntp6ntv(o 7rl/*a/sruvic4(vf1j d ly able to trigger a response in a cell by binding to a receptor in the plasma membrane?/t vs*ru(lj1cvi f v7d4(rao /
A. Insulin
B. Testosterone
C. Oestradiol
D. Progesterone
参考答案: A
本题详细解析:
Choice A is correct because inbdu plof+a1.p8b4y (anjc4 ;osulin is a peptide hormone, which is polar so cannot directly pass through the plasma membrane. Instead it binds to receptors in the plasma membrane which triggers intracellular signalling pathways.Choices B,&nbs1of.ancd l(o 8bj+ua4 p4;bypp;C and D are all incorrect, as they are all non-polar steroids so can diffuse through the plasma membrane and bind directly to receptors inside the cell, affecting gene expression.
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