Its capsid contains two strands of RNA, each of which is paired with a reverse transcriptase enzyme.  
This infectious agent's env protein exhibits variability that leads to three groups of its "one" variety, M, N, and O.  This virus's outer lipid membrane is punctured by gp41 proteins, which are bound to another protein that binds to the CD4 receptors on cells it attacks; that is a glycoprotein known as gp120.  Its capsid contains two strands of RNA, each of which is paired with a reverse transcriptase enzyme.  For 10 points, name this virus that attacks Helper T cells, and eventually causes AIDS.
This infectious agent's env protein exhibits variability that leads to three groups of its "one" variety, M, N, and O.  This virus's outer lipid membrane is punctured by gp41 proteins, which are bound to another protein that binds to the CD4 receptors on cells it attacks; that is a glycoprotein known as gp120.  
{HIV} or {Human Immunodeficiency} Virus [prompt on “{AIDS Virus}”; do not prompt on “{AIDS}”]