NURSING ANM AND GNM

Detailed explanation-1: -The existence of three distinct DNA viruses (the founder viruses) at the origin of DNA cells readily explains the erratic distribution of cellular DNA informational proteins versions and families in Archaea, Bacteria, and Eukarya, because each domain obtained its DNA informational proteins from a different virus.

Detailed explanation-2: -The simplest virions consist of two basic components: nucleic acid (single-or double-stranded RNA or DNA) and a protein coat, the capsid, which functions as a shell to protect the viral genome from nucleases and which during infection attaches the virion to specific receptors exposed on the prospective host cell.