You observe an enzymatic reaction that exhibits a standard relationship between reaction rate and substrate concentration as it converts substrate B to product C.When you add compound A, the creation of product C comes to a complete stop.You add large quantities of substrate B but still are unable to create product C in the presence of compound A.Compound A is therefore most likely a

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Noncompetitive inhibitors bind to an enzyme at a site other than the active site, which can change the shape of the enzyme and prevent it from binding to its substrate. The fact that adding more substrate B does not overcome the inhibition suggests that compound A is not competing with substrate B for the active site, which is characteristic of noncompetitive inhibition.

You Observe an Enzymatic Reaction That Exhibits a Standard Relationship