Lab Exam 1

Question 1

Identification of Streptococcus pneumoniae

Answer 1

Optochin (Sensitive)

Question 2

Identification of Viridans Streptococcus group

Answer 2

Optochin (Resistant)
Bile Esculin (negative)
Sodium Chloride (negative)

Question 3

Identification of Group D Streptococcus

Answer 3

Optochin (Resistant)
Bile Esculin (positive)
Sodium Chloride (negative)
PYR (negative)

Question 4

Identification of Enterococcus species

Answer 4

Optochin (Resistant)
Bile Esculin (positive)
Sodium Chloride (positive)
PYR (positive)

Question 5

Identification of Gamma Streptococci

Answer 5

No hemolysis (gamma hemolytic)
Bile Esculin (negative)
Sodium Chloride (negative)

Question 6

Identification of Group B Streptococci

Answer 6

Beta Hemolytic
Bacitracin (Resistant)
SXT (Resistant)
Hippurate hydrolysis (positive)
CAMP test (positive)

Question 7

Identification of Group A Streptococci

Answer 7

Beta Hemolytic
Bacitracin (Sensitive)
SXT (Resistant)
PYR (positive)

Question 8

Identification of Groups C, F, and G Streptococci

Answer 8

Beta Hemolytic
Bacitracin (Resistant)
SXT (Sensitive)
Latex agglutination for differentiation

Question 9

What Streptococcus Species can be Beta Hemolytic?

Answer 9

Group A
Group B
Groups C, F, and G
Group D
Enterococcus spp.

Question 10

Which Streptococcus species can be Alpha Hemolytic?

Answer 10

Streptococcus Pneumoniae
Enterococcus spp.
Viridans Streptococcus
Group D

Question 11

Which Streptococcus species can be Gamma Hemolytic?

Answer 11

Gamma Streptococcus
Group D
Enterococcus spp.

Question 12

What percent of bile is in Bile Esculin

Answer 12

40%

Question 13

Clinical name for optochin

Answer 13

ethylhydrocuprein hydrochloride

Question 14

genus and species of Group B Streptococcus

Answer 14

Streptococcus agalactiae

Question 15

genus and species for Group A Streptococcus

Answer 15

Streptococcus pyogenes

Question 16

Reagent in catalase test

Answer 16

3% H2O2

Question 17

Products during catalase test

Answer 17

O2 + H2O