Phosphorylation can be used to either inactivate or activate enzymes.This is a key element in the regulation of glucose metabolism.Phosphorylation of glycogen phosphorylase ________ it;phosphorylation of glycogen synthase ________ it.

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Phosphorylation activates glycogen phosphorylase, which is involved in glycogen breakdown, and inactivates glycogen synthase, which is responsible for glycogen synthesis. This allows for the regulation of glycogen metabolism in response to the body's needs.

Phosphorylation Can Be Used to Either Inactivate or Activate Enzymes