Question

Compare competitive and noncompetitive inhibition Question An enzyme is placed in the presence of an unknown substance to determine whether the substance is an inhibitor. As the substrate concentration is increased, the rate of reaction is compared to the normal rate of reaction. Initially, the rate is slower than normal, but as the substrate concentration is increased more and more, the rate of reaction approaches normal. What can be concluded about the unknown substance? Select the correct answer below: O It is a competitive inhibitor. O It is a noncompetitive inhibitor. O It is an evenly-divided mixture of competitive and noncompetitive inhibitors. O It is neither a competitive nor a noncompetitive inhibitor. P FEEDBACK MORE INSTRUCTION SUBMIT Content attribution

Answer 1

In competitive inhibition the inhibitor binds to the actual active site of the enzyme. Hence the affinity of the enzyme to the actual substrate is Decreased. So the binding of the enzyme -substrate is hindered so the rate of reaction falls.

Now when the concentration of the actual substrate is increased the active sites increases and out beats the inhibitor concentration hence the reaction rate increases substantially.

Hence the answer is - it is a competitive inhibitor