How can a cell control the rate of an enzyme-catalyzed reaction?

cells can control the rates of reactions involving these enzymes by regulating the movement of substrate molecules through the membrane. organisms may use hormones to carry messages from one part of the organism to another.

Explanation:

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igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

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