Explain how substrate concentration affects the rate of an enzyme-controlled reaction.

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Explain how substrate concentration affects the rate of an enzyme-controlled reaction.



Substrate concentration affects the rate of an enzyme-controlled reaction by the more substrate there is, the more frequently they can access the active sites of the enzyme. There is a limit to how fast the reaction can happen by adding more substrate. At one point, the concentration will be high enough that all the enzymes have their active sites occupied. This concentration is said to be saturated, and the rate of the reaction is determined by the speed at which the active site converts substrate to product.

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