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25 Cards in this Set
- Front
- Back
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Virsuses that infect bacteria |
bacteriophages |
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The switch from lysogenic prophage to a lytic cycle |
induction |
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Tiny, naked molecules of circular RNA, only a few hundred nucleotides long that are important infectious disease agents in plants |
viroids |
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Which type of flu viruses cause the most serious flu epidemics in humans mammals and birds |
Type A |
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The secondstep of viral contact with a host |
penetration |
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which of the following is not TSE? |
Flu |
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The most lethal virus in human history |
Influenza |
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Most animal viruses have a .... shape |
icosahedral |
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What are the cells primarily targeted in AIDS patients by HIV |
CD4+ cells |
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What virus caused a sudden outbreak of deadly pneumonia in the southwestern U.S in 1993? |
hantavirus |
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What basic structure is shared by all viruses? |
a core of nucleic acid surrounded by protein |
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What is a prophage? |
a DNA segment that is in a host cell's genome |
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What is SARS? |
Severe Acute Respiratory Syndrone |
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Why does HIV remain hidden so long? |
It goes through a 8 to 10 year latency period |
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How are viruses classified? |
The nature of their genomes |
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What virus causes chicken pox and shingles? |
varicella zoster |
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What is the first step of viral contact with a host? |
Attachment |
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When do viruses reproduce? |
when they enter the cell |
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Describe RNA viruses. |
Assembled in cytosol of infected eukaryotic cells, single stranded, and replicated |
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What is the capsid of a virus made of? |
One to a few molecules replicated repetedly |
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Describe the appearance of helical viruses. |
Rod like or thread like |
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List three major flu pandemics that occurred in the 20th century. |
Spanish Flu-1918-H1N1 Asian Flu-1957-H2N2 Hong Kong Flu-1968-H3N2 |
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What are the most common hosts of influenza virus ? |
Ducks, Chickens, Pigs |
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What are emerging viruses? |
Those that originate in one orginism pass to another and pass disease. |
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List five TSE's |
Scrapie, BSE,Chronic wasting elk and deer, Kuru, CJD |
