· Training test in medical microbiology ·

  1. Streptococcus pneumoniae is considered susceptible when penicillin MIC is:
    1. 0.5 mg/l
    2. 0.006 mg/l
    3. 2 mg/l
    4. 8 mg/l

    Look at the picture of an agar plate inoculated with a bacterium; two antibiotic disks are laid on the surface. The plate was inoculated with a pure culture of the bacterium.

  2. The growh around the disks may show :
    1. Small colony-variants of susceptible cells
    2. Colonies of cells with higher susceptibility grown from the a mixed culture
    3. Mixed inoculum consisting of a susceptible strainX and a different resistant strain Y.
    4. None of the above

  3. The phenomenon shown above may be explained also by:
    1. Two different populations of cells
    2. Heteroresistance
    3. Improper technique
    4. None of the above

  4. The phenomenon is typical and is very often encountered if the examined strain is:
    1. Streptococcus pneumoniae and the disks contains gentamicin
    2. Streptococcus pyogenes and the disks contains ampicillin
    3. Staphylococcus aureus and the disks contains oxacillin
    4. Staphylococcu epidermidis and the disks contains methicillin

  5. Mechanism of resistance to macrolides is explained:
    1. by mutation in the gene detremining gyrase
    2. Acetylation of the antibiotic
    3. Modification of ribosomes
    4. Impaired permeability

  6. Chromosomal mutation causes resistance to:
    1. Beta lactams in pneumococci
    2. Macrolides in E.coli
    3. Amikacin in Klebsiella pneumoniae
    4. Gentamicin in Enterococcus faecalis

  7. Which of the following is the most common cause of atypical pneumonia?
    1. Streptococcus pneumoniae
    2. Mycoplasma pneumoniae
    3. Mycobacterium tuberculosis
    4. Klebsiella pneumoniae
    5. Staphylococcus aureus

  8. In amebiasis, what is the chief site of extraintestinal disease?
    1. Liver
    2. Spleen
    3. Gall bladder
    4. Bile duct
    5. Skin

  9. Which of the following is a common protozoan cause of pneumonia in AIDS patients?
    1. Mycoplasma pneumoniae
    2. Candida albicans
    3. Paragonimus westermanni
    4. Pneumocystis carinii
    5. Aspergillus niger

  10. Negri bodies are a pathognomonic sign of
    1. Fungal meningitis
    2. Rabies
    3. Tubercular meningitis
    4. Herpesvirus encephalitis
    5. Tetanus

  11. Which of the following is the most common cause of pelvic inflammatory disease (PID)?
    1. Mycoplasma hominis
    2. Actinomyces israelii
    3. Chlamydia trachomatis
    4. Escherichia coli
    5. Treponema pallidum

  12. Which is the most efficacious penicillin for the treatment of Pseudomonas infections?
    1. Ampicillin
    2. Ticarcillin
    3. Amoxicillin
    4. Penicillin G
    5. Penicillin V

  13. Which of the following causes of pneumonia may result in bradycardia, vomiting, diarrhea, and mental confusion?
    1. Chlamydia pneumoniae
    2. Mycoplasma pneumoniae
    3. Streptococcus pneumoniae
    4. Legionella pneumophila
    5. Adenovirus

Correct answers


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