How is it that different cells can respond in different ways to exactly the same signaling molecule even when they have identical receptors

判断题There is no fundamental distinction between signaling molecules that bind to cell-surface receptors and those that bind to intracellular receptors.

判断题Water has a high specific heat.

判断题The density of water is less than the density of ice.

判断题Both the GTP-bound a subunits and nucleotide-free b complexes, but not GDP-bound, fully assembled G proteins, activate other molecules downstream of G-protein-linked receptors.

填空题是细胞外基质的受体蛋白。在结构上，它们是异二聚体，。这种跨膜蛋白的细胞外部分有一个球形的头部，可与细胞外基质蛋白结合，而细胞质结构域则可与 相结合。