MCQs MICROBIOLOGY: Streptococcus Bacteria

1.
The bacteria involved in the production of dental caries is/are

A. Streptococcus mutans
B. S sanguis
C. Both (a) and (b)
D. Streptococcus pyogenes
Answer & Explanation
Answer: Option C

2.
Which of the following test indicates the susceptibility to streptococcal pyrogenic exotoxin?

A. Schick test
B. Disk test
C. ASO test
D. Precipitation test
Answer & Explanation
Answer: Option B

3.
Which of the following condition is non-suppurative sequelae of Streptococcus pyogenesinfections?

A. Acute rheumatic fever
B. Acute glomerulonephritis
C. Erythema nodosum
D. All of these
Answer & Explanation
Answer: Option D

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5.
Streptococcus pyogenes can be differentiated from other haemolytic Streptococci on the basis of

A. Bacitracin sensitivity
B. Erythromycin sensitivity
C. Aminoglycosides sensitivity
D. Penicillin sensitivity
Answer & Explanation
Answer: Option A

6.
Streptolysin O is

A. antigenic
B. oxygen-labile
C. heat-labile
D. all of these
Answer & Explanation
Answer: Option D

7.
Cell wall protein of Streptococcus pyogenes crossreacts with human

A. synovial fluid
B. cardiac valves
C. myocardium
D. vascular intima
Answer & Explanation
Answer: Option C

8.
Individuals suffering from primary atypical pneumonia have agglutinins to

A. Streptococcus MG
B. S avium
C. S mutans
D. Enterococcus faecalis
Answer & Explanation
Answer: Option A

9.
Which of the following test(s) may establish retrospective diagnosis of streptococcal infection?

A. Anti-DNase B test
B. ASO test
C. Streptozyme test
D. All of these
Answer & Explanation
Answer: Option D

10.
The bacterial sore throat is caused by

A. Staphylococcus aureus
B. Haemophilus spp
C. Streptococcus pyogenes
D. Mycoplasma pneumoniae
Answer & Explanation
Answer: Option C

11.
Crystal violet blood agar is a selective medium for

A. β-haemolytic streptococci
B. Staphylococcus aureus
C. Corynebacterium diphtheriae
D. Mycobacterium tuberculosis
Answer & Explanation
Answer: Option A