How Does HIV-1 Protease Differ from Most Mammalian Aspartic Acid

Multiple Choice

How does HIV-1 protease differ from most mammalian aspartic acid proteases?

A) It has 2 subunits,each with a 2-aspartate active site.
B) It has 2 subunits,each contributing an aspartate to the active site.
C) It has 2 active sites on 1 protein.
D) It has 2 subunits,1 with an active site and the other with a regulatory activity.