Discussion
Consider the following statements about signal reception.
1. A steroid hormone binds an intracellular receptor.
2. A peptide hormone binds a receptor at the cell surface.
3. Any hormone can bind any receptor if the concentration is high enough.
Answer: C
The first two are correct and follow from solubility. The third is wrong, since binding depends on complementary shape, and raising the concentration of the wrong molecule does not create a fit. Specificity is structural rather than a matter of concentration.
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