a virus is best describes as a _____
A- living unicellular prokaryotic cell
B- piece of DNA that transform a bacterium
C- partially living agent that causes disease
D- nonliving particle that multiplies inside a cell
either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses may be viewed as mobile genetic elements, most probably of cellular origin and characterized by a long co-evolution of virus and host.
