Proteins are biological macromolecules with amino acids as its building blocks. These macromolecules have a wide range of functions: energy source, regulation, repair and maintenance, transport, catalysis, immune response, structure and support are functions covered by the different kinds of proteins in the body.
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.
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