What type of enzyme regulation occurs in the following situations?
a. Buildup of the product of the pathway that converts glucose to pyruvate stops at the first enzyme in the multistep process.

Feedback inhibition is a regulatory mechanism in metabolic pathways where the accumulation of an end product inhibits an earlier step in the pathway. In this case, when the product of the glucose to pyruvate conversion builds up, it signals the first enzyme to slow down or stop its activity, preventing overproduction and maintaining homeostasis.

Enzyme kinetics studies the rates of enzyme-catalyzed reactions and how they change in response to various factors, including substrate concentration and product levels. Understanding enzyme kinetics is crucial for analyzing how feedback inhibition affects the overall rate of a metabolic pathway, particularly in multistep processes.

Allosteric regulation involves the binding of regulatory molecules to an enzyme at sites other than the active site, leading to conformational changes that affect enzyme activity. In the context of feedback inhibition, the end product may act as an allosteric inhibitor, altering the enzyme's shape and reducing its activity, thereby controlling the flow of metabolites through the pathway.