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Ch. 19 Viruses (viruses (much smaller than a regular cell, does not…
Ch. 19 Viruses
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capsids and envelopes
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may be rod shaped, polyhedral, or more complex shapes
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Structure of a virus
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Largest viruses are around 1,500 nanometer are barely visible in light microscope
infectious particle consisting of nucleic acid closed by a protein coat and for some viruses surrounded with membranous envelope
genomes consist of double stranded DNA, signs stranded DNA, double RNA , or single RNA depending on the type of virus
Smallest viruses only have 3 genomes and largest have up to 2,000
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evolution of viruses
although viruses cannot replicate and carry out metabolic activities alone, their genetic doses make it hard to deny evolutionary connections
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Discovery of viruses
1883 German scientist came up with the concept of viruses, never actually saw them
Russian scientist proved the idea that viruses exist by using sap leaves of a plants that were infected and non-infected
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viral disease in plants
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viral diseases in plants include stunned growth, damaged flowers, and brown/bleached spots
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