With a branched biochemical pathway, why would it be important for a cell to shut down the first step as well as branching steps?

Throughout the semester we have seen that regulation is a key aspect of Biochemistry. It affects all aspects of the cell life cycle.  Choose 2(two) of the following and describe how “regulation” plays an important role.  NOTE:  We are not just talking about enzymatic control, but others levels of control too.  a. Committed/Pivotal steps in a metabolic pathway

Why is the process of activation a useful strategy in metabolism?

Would you expect an “enzyme” designed to bind its target substrate as tightly as it binds the reaction transition state to show a rate enhancement over the uncatalyzed reaction? In other words, would such protein be a catalyst? Use a reaction energy diagram to explain why or why not.