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Viruses - tailless icosahedral phage which consist of an...

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Viruses can persist by themselves but can replicate only by infecting a host cell and redirecting this cell to produce virus progeny. Viruses do not have a cellular structure!! Many viruses consist only of: genomic nucleic acid (DNA or RNA) and a protective protein coat or capsid (others may also contain other protein structures or may contain enzymes necessary during infection) Viruses infect all kinds of cells, those that infect bacteria are called bacteriophages or phages . Three basic phage structures observed are:
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Unformatted text preview: tailless icosahedral phage - which consist of an icosahedral capsid but no tail icosahedral phage with tail filamentous phage The most common genome in phage is double-stranded linear DNA, but you also find ss DNA, ds RNA and ss RNA. Genome size varies a lot between different types of phage- but in general- the more complex the genome, the more complex the phage. The life cycles of phages fit into 2 categories: • the lytic cycle • the lysogenic cycle...
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