Question

\fingertipase\ had a special structure, as do all enzymes, that matches which part of the cell to catalyze the reaction?
substrate
inhibitors
byproducts
inactive sites

Explanation:

Enzymes have an active site that is complementary in shape to their substrate. This allows the enzyme to bind to the substrate and catalyze the reaction. Inhibitors can bind to the enzyme but prevent the reaction. Byproducts are the result of the reaction, not what the enzyme's structure matches. Inactive sites are not relevant as enzymes work through their active site - substrate interaction.

Answer:

substrate