Phy.org logo

Top: Science: Biology: Genetics: Virus (3)

DescriptionA virus is a sub-microscopic infectious agent that is unable to grow or reproduce outside a host cell. It has genes made from either DNA or RNA, a protein coat that protects these genes but no cell membrane or nucleus.

Last update: Apr 28, 2012 18:35:07. Phy.org is a private web site, powered by the Open Directory Project.