Microbiology Exam MCQ Quiz!

35 Questions | Total Attempts: 313

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Microbiology Exam MCQ Quiz!

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Questions and Answers
  • 1. 
    Are the agents responsible for bovine spongiform encephalopathy (BSE) (Mad-cow disease)?
    • A. 

      Prions

    • B. 

      Viroids

    • C. 

      Virus

    • D. 

      Prokaryote

  • 2. 
    One of the following  describes Yeast colonies:
    • A. 

      Tend to spread outward and across larger areas.

    • B. 

      Grow to a certain size and stop and limited in their diameter.

    • C. 

      Fuzzy and fluffy or powdery in appearance.

    • D. 

      Impart a "moldy" odor to their substrates.

  • 3. 
    Which one of the following is incorrect with regard to Gram +ve and Gram -ve bacteria:
    • A. 

      In some Gram-positive bacteria glycerol–teichoic acids are bound to membrane lipids

    • B. 

      The envelope of Gram- negative cells is a far more complicated structure than Gram +ve cells.

    • C. 

      Under the light microscope Gram-negative cells appear purple  while Gram-positive cells are red.

    • D. 

      The Gram-positive cell wall consists primarily of a single type of molecule

  • 4. 
    They are involved in the genetic exchange process of conjugation.
    • A. 

      Fimbriae

    • B. 

      Slime layers

    • C. 

      Flagella

    • D. 

      Pili

  • 5. 
    Occur as a result of the exhaustion of essential nutrients and possibly the accumulation of bacteriostatic concentrations of wastes.
    • A. 

      The stationary phase,

    • B. 

      Phase A

    • C. 

      Log phase

    • D. 

      Phase D

  • 6. 
    Facultative bacteria:
    • A. 

      Bacteria cannot grow unless oxygen is present in their immediate atmosphere,

    • B. 

      A large number of Bacteria  can grow in both in the presence and absence of oxygen

    • C. 

      None of the choices

    • D. 

      Bacteria that  inhibited in the presence of oxygen, this gas behaving almost as an intoxicant

  • 7. 
    A key characteristic of biofilms:
    • A. 

      Bacterial biofilms are virtually difficult to eliminate with antibiotics or biocides.

    • B. 

      In the human body the resident cells within the biofilm are not exposed to attack by the immune system

    • C. 

      Enveloping of the attached cells in EPS.

    • D. 

      Biofilm formation usually begins with pioneer cells attaching to a surface 

  • 8. 
    Is the causal organism of venereal disease gonorrhea.
    • A. 

      Bacillus

    • B. 

      Vibrio

    • C. 

      Neisseria

    • D. 

      Campylobacter

  • 9. 
    Corynebacterium is the causal organism of:
    • A. 

      Tuberculosis

    • B. 

      Typhoid fever

    • C. 

      Asiatic cholera

    • D. 

      Diphtheria

  • 10. 
    Is the causal organism of the tick-borne Lyme disease:
    • A. 

      Borrelia

    • B. 

      Mycobacterium

    • C. 

      Salmonella

    • D. 

      Yersinia

  • 11. 
    One of the following dosent Gram-negative rods:
    • A. 

      Vibrio

    • B. 

      Treponema

    • C. 

      Helicobacter

    • D. 

      Haemophilus

  • 12. 
    Pseudomonas aeruginosa is resistant to many antibacterial agents.
    • A. 

      True

    • B. 

      False 

  • 13. 
    Viruses are capable of growing on manufactured medicines or raw materials.
    • A. 

      True

    • B. 

      False 

  • 14. 
    The Lipid A moiety It is a very potent stimulant of the immune system.
    • A. 

      True

    • B. 

      False 

  • 15. 
    Gonorrhea is a subclinical disease in males.
    • A. 

      True

    • B. 

      False

  • 16. 
    Shigella is considered to be more virulent than Salmonella.
    • A. 

      True

    • B. 

      False

  • 17. 
    Which of  the  following mainly cause the cystitis:
    • A. 

      Bacterial capsules

    • B. 

      Fimbriated (piliated) strains of Neisseria gonorrhoeae

    • C. 

      Fimbriated strains of E. coli

    • D. 

      Nonfimbriated (nonpiliated) strains of N. gonorrhoeae

  • 18. 
    Clostridium perfringens spreads deep within the body by secreting one of the following:
    • A. 

      Coagulase

    • B. 

      Necrotizing enzymes

    • C. 

      Kinases

    • D. 

      Collagenase

  • 19. 
    Which of the following mainly produce phospholipases that destroy the phagosome membrane:
    • A. 

      Toxoplasma gondii

    • B. 

      Rickettsia rickettsii

    • C. 

      Protozoans

    • D. 

      Mycobacterium tuberculosis

  • 20. 
    Biofilms and microcolonies an envelope with polysaccharide matrices.
    • A. 

      True

    • B. 

      False

  • 21. 
    Which of the following increases mucin production and decreases the proportion of ciliated epithelial cells:
    • A. 

      Bile salts that contain surfactants

    • B. 

      Inhalation of tobacco smoke

    • C. 

      The possession of surface adhesins

    • D. 

       Extreme acidity and presence of digestive enzymes

  • 22. 
    Lachrymal fluids alone can enzymatically degrade the peptidoglycan of Grampositive bacteria such as staphylococci.
    • A. 

      True

    • B. 

      False

  • 23. 
    The strategy for the microorganism to kill the phagocyte can be achieved by the production of:
    • A. 

      Endotoxin

    • B. 

      Bile salts

    • C. 

      Leucocidins

    • D. 

      Lipoteichoic acids

  • 24. 
    Toxins that indirectly activate plasminogen:
    • A. 

      Haemolysins

    • B. 

      Collagenases

    • C. 

      Hyaluronidases

    • D. 

      Fibrinolysins

  • 25. 
    The number of cases of malaria in the U.S. population at this moment, that represents 
    • A. 

       The point prevalence 

    • B. 

      The period prevalence

    • C. 

      Morbidity

    • D. 

      The incidence of a disease

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