A molecule binds and blocks the active site of an enzyme so that there can be no normal binding between the enzyme and its substrate. This molecule is called a(n) ___________.
a. irreversible inhibitor
b. uncompetitive inhibitor
c. reversible inhibitor
d. competitive inhibitor
e. none of the above.
Answer is d. The competitive inhibitor (It resembles the substrate and binds to the active site of the enzyme (Figure 8.15). The substrate is thereby prevented from binding to the same active site. A competitive inhibitor diminishes the rate of catalysis by reducing the proportion of enzyme molecules bound to a substrate.)
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