Researchers have isolated a previously unstudied protein, identified its complete structure in detail, and determined that it catalyzes the breakdown of a large substrate. The protein has two binding sites: one of these is large, apparently the binding site for the large substrate; the other is small, possibly a binding site for a regulatory molecule.
Which of the following inferences is most consisten with the data?
A. It is an enzyme that is regulated through allosteric inhibition.
B. It is a transport protein that allows molecules to cross the plasma membrane.
C. It is an enzyme that is regulated through competitive inhibition.
D. It is a structural protein that is involved in cell-to-cell adhesion.