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5 Cards in this Set
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Viruses
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-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) |
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Structure of Viruses
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-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). |
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Viral behavior
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-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). |
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Examples of DNA viruses?
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smallpox, adenoviruses (which cause colds, etc) and bacteriophages.
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Examples of RNA viruses?
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tobacco mosaic virus and HIV.
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