UMMC Micro test2 7th

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sullydog101
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176395
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UMMC Micro test2 7th
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2012-10-08 22:46:37
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UMMC Micro test2 7th
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UMMC Micro test2 7th
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  1. What is normally located at the head of a T shaped Bacteriophage?
    DNA
  2. What is normally located at the tail of a T shaped Bacteriophage?
    Injectosome
  3. What do male-specific phages attach to?
    The sex pili
  4. What did the Hershey chase experiment prove?
    • Phage DNA is what penetrates the cell (and is the genetic material)
    • DNA was labeled and so was virus coat protein
    • DNA penetrated the cell while the virus coat did not
  5. How many origins of replication does a conjugal plasmid have?
    • Two
    • One is the transfer origin that makes single stranded DNA for transfer
    • The other is the vegetative origin that makes double stranded DNA not related to conjugation
  6. What is NDM-1?
    • Beta-lactamase that is able to destroy many beta lactam drugs
    • Transfers among gram negative bacteria
  7. Which of the following is a property of a lysogenic phage?
    a. kills 100% of the infected host bacteria
    within one hour
    b. has a RNA genome
    c. produces a clear plaque
    d. seldom found in sewage
    e. can remain hidden within the host
    e. can remain hidden within the host
  8. The ability of a phage to extensively replicate in a bacterial strain can be dependent upon:
    A. the endonculease produced by the phage
    B. methylation of the phage structural proteins
    C. methylation of the phage early mRNA
    D. methylation of the phage DNA
    D. methylation of the phage DNA
    (this multiple choice question has been scrambled)
  9. What do the diseases Staph food poisoning
    and diphtheria have in common?
    a. both are caused by an exotoxin
    b. the disease requires a molecular process
    known as “lysogenic conversion”
    c. the toxin involved is a product of a phage
    gene
    d. all of the above
    d. all of the above
  10. An antibiotic resistant strain that causes an outbreak of infection in a hospital ward can have resistance genes located on:
    a. one or more small, non-conjugal plasmids
    b. a large conjugal plasmid
    c. their chromosome
    d. all of the above at the same time
    d. all of the above at the same time
  11. A beta-lactamase gene can have a better chance of having resistance to more drugs after which one of the following?
    A. It locates on a RNA phage
    B. It locates on a small, non-conjugal plasmid
    C. it locates on a large, conjugal plasmid
    D. it increases the production of its mRNA
    B. it locates on a small, non-conjugal plasmid
    (this multiple choice question has been scrambled)

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