Sentence:  RNA replaces DNA as the genetic material in many viruses (for example, <WSD>tobacco mosaic</WSD>, influenza, polio, certain RNA phages). 
Meaning of the word marked with <WSD> tags:  "Tobacco mosaic virus", an RNA virus (of genus (noshow=1)) that infects plants, especially tobacco and other members of the family Solanaceae, causing characteristic patterns of mottling and discoloration on the leaves.