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15 Cards in this Set
- Front
- Back
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How many viruses are found in sea water?
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a million per ml
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What are viroids?
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viruses that only infect plants and have RNA
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what are virusoids?
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infect animal cells when they are encapsulated in other viruses and have RNA only
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what do prions contain?
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protein only
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how can you see viruses?
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electron microscope
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what are capsids made up of ?
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self-assembling protomers
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do protomers require self-assembly?
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yes
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describe the capsids of helical viruses
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they are as large as the NA and the protomers bind to the NA directly
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What type of capsid does TMV have?
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helical
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what type of capsid does influenza have ? what else does it have?
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helical, and it has an envelope too
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Where are the envelopes of eukaryotic cell viruses derived from?
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cytoplasmic membrane they have elaborate extra cellular structures
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how are envelopes added to viruses?
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they are aded when the phage escapes cells through budding from the CM
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where do spikes come from?
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they're put into the membrane before budding
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what is a special spike protein that helps release from host cells?
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neuroaminidase
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what are spikes used for?
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attachment to host cells
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