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 only able to trigger a response in a ce j.y( gvl5d9igll by bindi,pla* bpywj 0hniy870 ng to a receptor in the plasma 0n,pw7 ia 0l*byhyp 8jmembrane?
A. Insulin
B. Testosterone
C. Oestradiol
D. Progesterone
参考答案: A
本题详细解析:
Choice A is corr s4dd p1:kk*sa80ffx bt:j:r gect because insulin is a peptide hormone, which is polar so cannot directly pass through the plasma membrane.jrfkp40d : txfs* d :ka1g8:sb Instead it binds to receptors in the plasma membrane which triggers intracellular signalling pathways.Choices B, 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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