A) Describe how allosteric enzymes are regulated by activator and inhibitor regulatory molecules. B) Explain how ATP and ADP act as allosteric regulators of enzymes that are responsible for ATP production, and how that is an example of feedback inhibition.

C) What is feedback inhibition? How is the ATP generating pathway discussed in part B an example of feedback inhibition?

A) Activator molecules regulate Allosteric enzymes by binding to a regulatory site and stabilizes the area that has active sites that are functional. Inhibitor regulatory molecules stabilize the Allosteric enzymes by binding to the part of the enzyme that is inactive.

B) ATP is a renewable resource that can be regenerated by the addition of phosphate to ADP. With these two organic compounds relying on each other they act like allosteric regulators for enzymes that make the production of ATP. The molecules that bind cellular respiration enzymes act as signals, giving the enzyme information about the cell's energy state. AMP and ADP bind to the allosteric site as to facilitate the formation of the R state by inducing structural changes in the enzyme. An example of feedback inhibition is an anabolic pathway. Anabolic pathways are those that require energy to synthesize large molecules.

C) Feedback inhibition is a method of metabolic control in which the end product of a metabolic control in which the end product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway. The reason an ATP-generating pathway formed by the ATP itself is because of feedback inhibition. Some cells use this five-step pathway to synthesize the amino acid isoleucine from threonine, another amino acid. As isoleucine accumulates, it slows down its own synthesis by allosterically inhibiting the enzyme for the first step of the pathway. Feedback inhibition thereby prevents the cell from making more isoleucine than is necessary, and thus wasting chemical resources.

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