Knowing the Structure of the HIV Tree Allowed Scientists to Pinpoint

Multiple Choice

Knowing the structure of the HIV tree allowed scientists to pinpoint which specific adaptation that allowed HIV to infect humans?

A) an increase in virulence
B) an enzyme that allows the virus to break down white blood cells
C) a mutation in a gene that encodes the shell of the virus
D) a mutation changing the shape of the hemagglutinin stalk