Microbiology 14 1.A gram positive cocci, with a cluster arrangement, and gold co

Question

Microbiology 14

1.A gram positive cocci, with a cluster arrangement, and gold color colony, is isolated from an infected hair follicle. If the organism is S. aureus, which tests results would you expect?
           A. mannitol positive
           B. coagulase positive
           C. catalase negative
           D. A, and B
           E. A, B, and C

2. Some strains of Staphylococcus aureus produce B-lactamases, these enzymes make the organism
        A. more difficult to treat
           B. resistant to B-lactam antibiotics
           C. able to survive phagocytosis
           D. A, and B
           E. A, B, and C

3. What are superantigens?
         A. protein toxins secreted by some strains of S. aureus.
           B. large antigenic molecules that can't be bound by antibodies
           C. toxins like the staphylococcal toxic shock syndrome toxin, that cause a massive and harmful response by the immune system.
           D. A and C
           E. B and C

4. The virulence of M. tuberculosis is due to its acid fast cell wall
       A. True
       B. False

5. A positive tuberculin test detects the presence of antibodies, and can identify an LTBI
   A. True
       B. False

6. Active tuberculosis infections require long term antibiotic treatment with a combination of antibiotics
   A. True
       B. False

Explanation / Answer

1-d

2-e

3-d

4-a

Note- mycobacterium tuberculi has two antigen one which is main virulence factor is its acid fast wall.

The s aureus is mannitol positive can ferment mannitol .

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