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10 Cards in this Set
- Front
- Back
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Name 5 things that bacteria have or can do, and that viruses don't have or can't do.
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Plasma membrane, binary fission, possess both RNA and DNA, ATP-generating metabolism, and ribosomes.
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Are viruses non-host-specific, sometimes host-specific, or always host-specific?
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They are usually host-specific, but can quickly mutate to adapt to a different species.
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What does it mean if a virus is called "oncogenic"?
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It initiates cell transformation.
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What is a useful function of a virus?
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Transferring genes under controlled conditions.
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What criteria are used to classify viruses?
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Type of nucleic acid, replication strategy, and morphology (appearance).
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What commonalities do members of a viral species share?
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The same genetic information, and the same ecological niche.
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Do viruses vary much in size? in shape?
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Yes, from 30-300 nm; yes.
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How many strands do most DNA viruses have? Describe the exceptions.
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Most are double stranded. Parvoviruses are single-stranded, and hepadnaviruses are partially double-stranded.
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How many strands do most RNA viruses have? Describe the exceptions.
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Most are single-stranded. Reoviridae are not.
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What is a "positive-sense RNA"? A "negative-sense"?
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Positive-sense means that it can immediately use the ribosomes for transcription. Negative-sense means it is complementary and must be transcribed by an RNA polymerase to positive-sense.
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