Final answer:
HIV initiates replication by latching on to the CD4 receptor and glycoproteins gp120 and gp41.
Step-by-step explanation:
HIV initiates replication by latching on to two proteins: CD4 receptor and glycoproteins gp120 and gp41. The CD4 receptor is a glycoprotein found on the surface of T cells, while gp120 and gp41 are proteins derived from the host cell that HIV uses to attach and enter the cell. These proteins play crucial roles in the initial stages of HIV replication, allowing the virus to fuse with the cell membrane and release its contents into the cell.