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What is the effect of substrate concentration on enzyme activity? How does enzyme activity change as substrate concentration decreases? Explain on a molecular basis.

I am not sure what the question wants from me. Would this be right, and is there anything missing from my response? :: As the substrate concentration increases, the rate of reaction also increases. This is because more of the substrate is available to allow the enzyme to bind to it.

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    or wait..is it because if more substrate is available, then reactions will occur faster? I need some help wording this, please :)

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