问题
判断题
There is no fundamental distinction between signaling molecules that bind to cell-surface receptors and those that bind to intracellular receptors.
答案
参考答案：错
解析：错误。与细胞表面受体结合的信号分子不必跨过质膜, 因此, 此类信号分子可大可小, 疏水或亲水。但与细胞内受体结合的信号分子必须足够小和疏水。