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12 Cards in this Set
- Front
- Back
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What was one example of early evidence of the existance of viruses? Why were they difficult to study?
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The Tobacco Mosaic Virus. They were hard to study because they're so small.
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What are the four forms of viral genomes?
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Double-stranded DNA
Single-stranded DNA Double-stranded RNA Single-stranded RNA |
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What protein subunit makes up capsids?
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Capsomeres
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Regarding the viral envelope, where do the phospholipids and membrane proteins come from?
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They come from the host cell membrane.
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What is a restriction enzyme and how does it relate to bacteria?
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Restriction enzymes are enzymes that cut up DNA at "restriction sites" to create "restriction fragments". In bacteria, they help protect the bacteria against viral DNA/RNA.
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Of the following, which is least related to the others:
Corepressors Repressor Inducer Transposon cAMP Receptor Protein |
Transposon
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How does active CAP indice expression of the genes of the lactose operon?
a) It terminates production of repressor molecules. b) It degrades the substrate allolactose. c) It stimulates the binding of RNA polymerase to the promoter. d) It binds steroid hormones and controls translation. |
c) It stimulates the binding of RNA polymerase to the promoter.
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The lactose operon is likely to be transcribed when
a) there is more glucose in the cell than galactose. b) the cyclic AMP levels are low. c) there is lactose but no glucose in the cell. d) the cyclic AMP and lactose levels are both high within the cell. e) both C and D |
e) both C and D:
there is lactose but no glucose in the cell. the cyclic AMP and lactose levels are both high within the cell. |
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An R plasmid can
a) facilitate bacterial resistance to antibiotics. b) adjust the rates of metabolic pathways. c) repress gene expression. d) convert an F+ to an F- bacterium. e) reverse the direction of transcription. |
a) facilitate bacterial resistance to antibiotics.
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Viruses with single-stranded RNA that acts as a template for DNA synthesis are known as
a) retroviruses b) proviruses c) viroids d) lytic phages |
a) retroviruses
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Which of the following can be effective against viral diseases?
a) vaccination b) nucleoside analogs that inhibit DNA synthesis c) antibiotics d) A & C Only e) A & B Only |
e) A & B Only
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T or F? Viruses are not the most infective aganets?
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True.
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