BACTERIA QUIZ
Colonies on tryptic soy agar,
24 hours, 37°C.
Site of isolation: skin
1. The bacterium you see in the picture is:
Shigella sonnei
Enterococcus faecalis
Staphylococcus aureus
2. What kind of hemolysis would you expect on blood agar (with sheep or horse erythrocytes):
alpha
beta
gamma
3. The oxidase test in this bacterium is:
negative
positive
variable results
4. On Endo agar (or MacConkey agar) it will grow in:
medium lactose positive colonies
large lactose negative colonies
no growth or strongly inhibited
Colonies on tryptic soy agar,
24 hours, 37°C.
Enterococcus faecalis
Pseudomonas aeruginosa
Staphylococcus aureus
5. Smaller whiter colonies belong to:
Enterococcus faecalis
Pseudomonas aeruginosa
Staphylococcus aureus
6. Oxidase positive is:
Enterococcus faecalis
Pseudomonas aeruginosa
Staphylococcus aureus
7. The catalase test is negative in:
Enterococcus faecalis
Pseudomonas aeruginosa
Staphylococcus aureus
8. Which of the three species below does not grow on MacConkey agar:
S.aureus
and
P.aeruginosa
Pseudomonas aeruginosa
S.aureus
and
E.faecalis
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