Sequencing of the HIV-1 Genome Revealed That It is Most

Question

Sequencing of the HIV-1 genome revealed that it is most closely related to ____.  
A) simian immunodeficiency virus
B) feline immunodeficiency virus
C) bovine immunodeficiency virus
D) hepatitis B
E) H1N1

Accepted Answer

Sequencing of the HIV-1 genome revealed that it is most closely related to simian immunodeficiency virus (SIV) found in chimpanzees and gorillas, suggesting that HIV-1 originated from a cross-species transmission of SIV to humans.