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In an assay for an enzyme that obeys Michaelis kinetics and has a single active site...

In an assay for an enzyme that obeys Michaelis kinetics and has a single active site with a catalytic rate constant of 400 s-1 , you find an initial velocity of 50 µM product/min. What is the concentration of the enzyme in the assay?

a. 50 µM b. 70 µM c. 21 nM d. 155 nM e. 250 pM

answer is 21

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