Microbiology Exam Prep V3

22 Questions

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Questions and Answers
  • 1. 
    Which of the following is not true about spikes?
    • A. 

      They are used for absorption

    • B. 

      They are used for penetration

    • C. 

      They may cause haemagglutination

    • D. 

      They are only found on enveloped viruses

  • 2. 
    • A. 

      The host species

    • B. 

      The type of cells

    • C. 

      The availability of an attachment site

    • D. 

      Cell factors necessary for replication

    • E. 

      All of the above

  • 3. 
    • A. 

      Viruses contain DNA or RNA

    • B. 

      The nucleic acid of a virus is surrounded by a protein coat

    • C. 

      Viruses multiply inside living cells using viral mRNA, tRNA and ribosomes

    • D. 

      Viruses cause the synthesis of specialised infectious elements

    • E. 

      Viruses multiply inside living cells

  • 4. 
    A viroid is
    • A. 

      A complete infectious virus particle

    • B. 

      A naked infectious piece of RNA

    • C. 

      A capsid without any nucleic acid

  • 5. 
    An enveloped virus acquires its envelope during _____________
    • A. 

      Penetration

    • B. 

      Adsoprtion

    • C. 

      Uncoating

    • D. 

      Release

  • 6. 
    • A. 

      Finding oncogenes in viruses

    • B. 

      The presence of antibodies against viruses in cancer patients

    • C. 

      Cancer following the injection of cell-free filtrates

    • D. 

      Treating cancer with antibodies

    • E. 

      Some liver cancer patients having had hepatitis

  • 7. 
    Generally, in a DNA-virus infection, the host animal cell supplies all of the following except
    • A. 

      RNA polymerase

    • B. 

      Nucleotides

    • C. 

      DNA polymerase

    • D. 

      TRNA

    • E. 

      None of the above

  • 8. 
    Which of the following is most useful in determining whether two organisms are related?
    • A. 

      If both ferment lactose

    • B. 

      If both are gram-positive

    • C. 

      If both are motile

    • D. 

      If both are aerobic

    • E. 

      All are equally important

  • 9. 
    Into which group would you place a photosynthetic cell that lacks a nucleus?
    • A. 

      Animalia

    • B. 

      Bacteria

    • C. 

      Fungi

    • D. 

      Plantae

  • 10. 
    • A. 

      Endospore-forming cocci

    • B. 

      Mycobacteria

    • C. 

      Gram-negative aerobic cocci

    • D. 

      Anaerobic gram-negative rods

    • E. 

      None of the above

  • 11. 
    Which of the following do you expect to be most resistant to high temperatures?
    • A. 

      Bacillus subtilis

    • B. 

      Eschericia coli

    • C. 

      Neisseria gonorrhoeae

    • D. 

      Staphylococcus aureus

    • E. 

      Streptococcus pyogenes

  • 12. 
    Which of the following lacks a cell wall?
    • A. 

      Eschericia

    • B. 

      Mycoplasma

    • C. 

      Mycobacterium

    • D. 

      Clostridium

    • E. 

      Streptococcus

  • 13. 
    Rickettsias differ from chlamydias in that rickettsias
    • A. 

      Are gram-negative

    • B. 

      Are intracellular parasites

    • C. 

      Require an arthropod for transmission

    • D. 

      All of the above

    • E. 

      None of the above

  • 14. 
    • A. 

      Move towards an attractant

    • B. 

      Move away from a repellant

    • C. 

      Both a and b

    • D. 

      Neither a nor b

  • 15. 
    The best definition of HUMORAL immunity is:
    • A. 

      Immunity involving soluble antibodies

    • B. 

      Immunity involving STEM CELLS

    • C. 

      Immunity involving the lymphatics system

    • D. 

      Immunity involving T cells

    • E. 

      Immunity involving platelets

  • 16. 
    The most common type of antibody in the serum is:
    • A. 

      IgG

    • B. 

      IgE

    • C. 

      IgM

    • D. 

      IgA

    • E. 

      IgD

  • 17. 
    Each antibody has THREE binding sites, one at the end of each arm of the "Y"
    • A. 

      True

    • B. 

      False

  • 18. 
    Each antigen-binding site of an antibody molecule is composed of:
    • A. 

      The Fc domain

    • B. 

      The light chains

    • C. 

      The variable domains of one light and one heavy chain

    • D. 

      The constant domains of one light and one heavy chain

    • E. 

      The variable domains of two light chains

  • 19. 
    Antigenic peptides that are presented by antigen presenting cells are called:
    • A. 

      Fc fragments

    • B. 

      Secretory fragments

    • C. 

      Epitopes

    • D. 

      Antibodies

  • 20. 
    An important characteristic of IgA is:
    • A. 

      It is found in secretions

    • B. 

      It can cross the placenta

    • C. 

      It is the first Ab secreted in response to antigen stimulation

    • D. 

      All of the above

  • 21. 
    The secondary immune resonse
    • A. 

      Display a more rapid onset than primary responses

    • B. 

      Reach higher maximum levels than primary responses

    • C. 

      Display a more acute rise (steeper slope) in immune activity over time than primary resonses

    • D. 

      Will often prevent disease

    • E. 

      All of the above

  • 22. 
    Opsonisation
    • A. 

      Is mediated by the interaction of antibodies with the Fc receptors on phagocytes

    • B. 

      Results in more efficient ingestion of antigen by phagocytes

    • C. 

      Is important in resisting and/or fighting many bacterial infections

    • D. 

      Is particularly well-mediated by several of IgG

    • E. 

      All of the above