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5 Cards in this Set

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  • Back
Viruses
-Smallest of all microorganisms (50 times smaller than a bacterium)
-'Intracellular parasites' (they can exist and reproduce as parasites only in the cells of other living organisms)
Structure of Viruses
-Have geometric shapes with similar basic structures.
-Some viruses have an envelope.
-They have a protein coat called a Capsid made of simple repeating unis known as Capsomeres
-Viral genetic material is either DAN (double stranded) or RNA (single stranded).
Viral behavior
-Viral DNA acts directly as a template for new viral DNA or for mRNAs for protein synthesis.
-Bacteriophages attack bacteria and use them for reproduction.
-Viruses attach to their host cells by means of specific proteins (antigens) known as virus attachment particles (VAPs).
Examples of DNA viruses?
smallpox, adenoviruses (which cause colds, etc) and bacteriophages.
Examples of RNA viruses?
tobacco mosaic virus and HIV.