Test: GRE Subject Test: Biochemistry, Cell, and Molecular Biology

1.

A researcher is studying the rate of an enzyme-catalyzed reaction by placing increasing amounts of substrate into a solution containing the enzyme. After a certain concentration, the rate of the reaction plateaus and does not go any higher. What has happened?

The enzyme has become denatured

The reaction rate has only momentarily plateaued; given enough time it will increase

The enzyme has become saturated

The concentration of enzyme is so small that the reaction has stopped occurring completely

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