Which of the Following Characteristics Is Most Likely to Be

Multiple Choice

Which of the following characteristics is most likely to be associated with an enzyme that catalyzes two different chemical reactions?

A) The enzyme contains both α-helix and β-pleated sheet regions.
B) The enzyme is subject to both competitive inhibition and allosteric regulation.
C) The enzyme is composed of at least two identical subunits.
D) The enzyme has two distinct active sites.