1. A throat isolate exhibits alpha hemolysis and bacitracin resistance. Which of

Question

1. A throat isolate exhibits alpha hemolysis and bacitracin resistance. Which of the following bacteria could it be?

a. Streptococcus equi

b. Streptococcus agalacitae

c. Streptococcus pyogenes

d. Enterococcus faecalis

2. Members of which genus of bacteria are best stained using the acid fast method?

a. Mycobacterium

b. Staphylococcus

c. Yersinia

d. Streptococcus

3. While _____bacteria retainb carbol fuchsin after acid-alcohol treatment, ______bacteria are decolorized by acid-alcohol.

a. gram-negative; gram-positive

b. pathogenic; non-pathogenic

c. non-acid fast; acid-fast

d. acid fast; non-acid fast

4. A thick waxy layer of what substance in the cell wall constitutes the major portion of the mycobacterial cell wall, separating it from other microorganisms?

a, proteins

b. polysaccharides

c. mycolic acids (lipoidal)

d. nucleic acids

Explanation / Answer

1. d. Enterococcus faecalis

Because other three Streptococcus shoe beta- hemolysis. Although E. faecalis show beta hemolysis, but it ialso exhibit alpha hemolysis and it also bacitracin resistance.

2. a. Mycobacterium

Acid-fast stain method is used for those microorganisms which are not staining by simple or Gram staining method, particularly the member of genus Mycobacterium, are resistant and can only be visualized by acid-fast staining.

3. d. acid fast; non-acid fast

4. c. mycolic acids (lipoidal)

Mycolic acids are long fatty acids found in the cell walls of the mycolata taxonThey form the major component of the cell wall of mycolata species.

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