Enzymes that are expressed at a constant level all the time are said to be .

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Enzymes that are expressed at a constant level all the time are called "constitutive enzymes." This means that they are always present and performing their function, regardless of the conditions or environment surrounding them. Inducible enzymes are only produced in response to a specific signal or substrate, while repressible enzymes are produced until a certain amount of their end product is reached, at which point their production is slowed or stopped. Attenuated enzymes have their activity reduced, often through some sort of mutation or genetic modification.

Enzymes That Are Expressed at a Constant Level All the Time