SCOTT CAMAZINE / SHARON BILOTTA-BEST / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SHARON BILOTTA-BEST / SCIENCE PHOTO LIBRARY
Tobacco mosaic viruses. Coloured Transmission Electron Micrograph (TEM) of rod-shaped virus particles of tobacco mosaic virus (TMV). Each long virus, seen here, consists of a protein coat with internal genetic material of RNA. The virus enters a host cell in a tobacco plant and commandeers its DNA, instructing it to reproduce more TMV's. The effect of TMV infection varies from outright death of the host plant to severe lesions or mottling of the leaves. Plant viruses like TMV are transmitted by insects, pests and nematode worms. Negatively stained. The scale bar (at upper right) represents 0.1 micron.
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