3. We saw in this chapter that a given enzyme its only one specific receptor, like a lock that accepts one key. We also saw in chapter 2 that enzyme-substrate interactions are like a lock and key. (a ) Discuss the similarities between hormone-receptor and enzyme-substrate interactions, and (b) identify the most important difference between them . One of these systems requires only very tiny amounts of either hormone or substrate , whereas the other uses a much greater quantity. (Identify which is which, and () explain the reason for this difference in view of your answer to part)