Bacteriology - Taxonomy

Question 1

Name two genera of gram-positive cocci:

Answer 1

1. Streptococcus

2. Staphylococcus

Question 2

Name four genera of gram-positive bacilli:

Answer 2

1. Clostridium
2. Listeria
3. Bacillus
4. Corynebacterium

Question 3

Which of these gram-positive bacilli are spore forming?

Answer 3

Clostridium and Bacillus

Question 4

Which gram-positive cocci are catalase positive (+)?

Answer 4

Staphylococcus

Question 5

Which of these is also coagulase (+)?

Answer 5

Staphylococcus aureus

Question 6

Name the streptococci that typically show the following pattern of hemolysis:

α (green/partial hemolysis) “αlmost hemolytic”

Answer 6

Streptococcus pneumoniae and viridans group (eg, Streptococcus mutans)

Question 7

Name the streptococci that typically show the following pattern of hemolysis:

β (clear hemolysis) “βetter hemolysis”

Answer 7

Group A (Streptococcus pyogenes) and group B (Streptococcus agalactiae)

Question 8

Name the streptococci that typically show the following pattern of hemolysis:

γ (no hemolysis)

Answer 8

Group D (Enterococcus and Peptostreptococcus)