Bacteria and viruses have DNA too,
DNA Learning Center,
Cold Springs Laboratory,
Provides a concept, animation, gallery, video, and more. READ MORE http://www.dnaftb.org/18/
Viruses: Structure, Function, and Uses,
W.H. Freeman Company,
National Center for Biotechnology Information,
National Institute of Health,
Mostly text with multiple "Figures" you can click on fo READ MORE http://www.ncbi.nlm.nih.gov:80/bookshelf/br.fcgi...
Virus
Wikipedia.org
An extensive article with photos and illustrations. It directs you to other pages that explain different groups of viruses (DNA & RNA). READ MORE http://en.wikipedia.org/wiki/Virus
A virus is a small infectious agent that can't reproduce by itself; once it affects a cell, however, it can tell the cell to make more viruses.