The Water Deer (Hydropotes inermis) is a usually solitary animal, besides the rutting months, and a good swimmer. There exist two subspecies: the Chinese Water Deer (Hydropotes inermis inermis) and the Korean Water Deer (Hydropotes inermis argyropus).
Viruses lack most of the internal structure and machinery which characterize 'life', including the biosynthetic machinery that is necessary for reproduction. In order for a virus to replicate it must infect a suitable host cell.
Prions and viroids are the smallest infectious agents. Prions are infectious protein particles, and viroids are infectious strands of RNA. Viroids differ from viruses iâ¦n that they are ONLY a strand of RNA. Viruses have a protein coat protecting the nucleic acid molecule and some even have a lipid layer over that.