Enzymes that are always present, regardless of the amount of substrate are

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Constitutive enzymes are always present in the cell, regardless of the amount of substrate. They are responsible for carrying out the basic metabolic functions of the cell. Apoenzymes are inactive enzymes that require a cofactor or coenzyme to become active. Axoenzymes are enzymes that require a specific ion to be active. Regulated enzymes are enzymes that are produced in response to a specific metabolic need, and endoenzymes are enzymes that are produced inside the cell and function within the cell.

Enzymes That Are Always Present, Regardless of the Amount of Substrate