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

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    yes, the reason is that there are more activation sites available for the enzyme to attach to and thus react with.

    increasing rxn sites => increase rxn rate
    opposite does the opposite of course

    unfortunately that's all I can help with what I remember from memory
    (I sold my bio book)

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