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10 Cards in this Set
- Front
- Back
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what is the protein sheath around viruses' nucleic acid core called
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capsid
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the suitable cells for a particular virus are called
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its host range
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what is tissue tropism
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when viruses only target a specific set of cells
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when they are outside of a host cell viral particles are called
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virions
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viruses replicate by taking over a hosts cell systems and are thus called
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obligate intracellular parasites
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what are the two types of life cycle for bacteriophages (viruses taht infect bacteria)
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lytic and lysogenic
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describe lytic cycle
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-results in immediate death of host
-the virus lyses the infected host cell by multiplying a shit ton |
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describe lysogenic cycle
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-they integrate their nucleic acid into the genom of host
- then transmitted vertically by cell division - under stress then reverts to lytic cycle |
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how does HIV retrovirus cause AIDS
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-enters cell via membrane fusion
-infects host's CD4+ T cells, killing them, which compromises the immune system |
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why do we have to get new flu shots
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influenza virus undergoes recombination frequently, so they arent recognized by antibodies against past infections
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