At a fixed enzyme concentration, the rate of reaction is measured as substrate concentration is increased. The rate
Aincreases indefinitely.
Bdecreases steadily.
Cincreases at first and then levels off.CORRECT
Dremains constant throughout.
JUPEBBiologyEnzymes
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Why the answer is C, and why the others tempt you.
At low substrate concentration many active sites are free, so rate rises with substrate. Eventually every active site is occupied at all times (the enzyme is saturated) and the rate reaches a maximum limited by the amount of enzyme.
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