Why is concentration of an enzyme in a cell is much lower than that of its substrate?

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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Why is concentration of an enzyme in a cell is much lower than that of its substrate?

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The enzyme acts as a biological catalyst and speeds up metabolic reactions. Enzymes have active sites in which substrates bind to form certain products. The concentration of substrate affect enzyme activity. 

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