Exam 1: Bacteria Identification Gram +

Question 1

What are the 2 (Gram +) anaerobic cocci?

Answer 1

-Peptococcus
-Peptostreptococcus

Question 2

Gram +, Aerobic, Cocci fall into which two categories?

Answer 2

Clusters (catalase +)

Pairs/Chains (catalase -)

Question 3

A positive catalase test done on a Gram +, aerobic, cocci indicates what?

Answer 3

The bacteria forms clusters

Question 4

A negative catalase test done on a Gram +, Aerobic, Cocci indicates what?

Answer 4

The bacteria forms pairs/chains

Question 5

For Gram + Cocci, what are the 2 categories that bacteria who form aerobic clusters can fall into?

Answer 5

Coagulase + (bubbles)

Coagulase - (no bubbles)

Question 6

Bubbles in a catalase test indicate what about the bacteria being tested?

Answer 6

Coagulase (+)

Question 7

No bubbles in a catalase test indicate what about the bacteria being tested?

Answer 7

Coagulase (-)

Question 8

A bacteria is Gram (+), Cocci, Aerobic, forms Clusters, and is Coagulase (+). What is it?

Answer 8

Staphylococcus aureus

Question 9

A bacteria is Gram (+), Cocci, Aerobic, forms Clusters, and is Coagulase (-). What is it?

Answer 9

CoNS

(Staphylococcus epidermis/ coagulase-negative staphylococcus)

Question 10

Gram (+), Aerobic, Cocci, who form Pairs/Chains fall into what 3 categories?

Answer 10

alpha-hemolysis (partial)

beta-hemolysis (full)

gamma-hemolysis (nonhemolytic)

Question 11

A Gram (+), Cocci who forms Pairs/Chains demonstrates PARTIAL HEMOLYSIS.
What group does this cocci fall into?

Answer 11

alpha-hemolysis

Question 12

A Gram (+), Cocci who forms Pairs/Chains demonstrates FULL HEMOLYSIS. What group does this cocci fall into?

Answer 12

beta-hemolysis

Question 13

A Gram (+), Cocci who forms Pairs/Chains demonstrates NO HEMOLYSIS. What group does this cocci fall into?

Answer 13

gamma-hemolysis

Question 14

A Gram (+), Aerobic, Cocci, who is Catalase (-), demonstrates partial (alpha) hemolysis.
What 2 bacteria could it be?

Answer 14

-Streptococcus pneumoniae
-Viridans streptococci

Question 15

A Gram (+), Aerobic, Cocci, who is Catalase (-), demonstrates full (beta) hemolysis.

What 2 bacteria could it be?

Answer 15

-Streptococcus pyrogenes (Group A)

-Streptococcus agalactiae (Group B)

Question 16

A Gram (+), Aerobic, Cocci, who is Catalase (-), demonstrates no (gamma) hemolysis.

What 2 bacteria could it be?

Answer 16

-Enterococcus faecium

-Enterococcus faecalis

Question 17

You receive a call from the microbiology lab informing you that patient JR has Gram positive cocci growing in the blood. They don’t have a full identification but tell you the organism is catalase positive, coagulase positive. Which of the following organisms could be growing in JR’s blood?

a) Staphylococcus aureus
b) Staphylococcus epidermidis
c) Streptococcus pyogenes
d) Enterococcus faecalis

Answer 17

A. Staphylococcus aureus

Question 18

You receive a call from the microbiology lab informing you that patient ZE has Gram
negative rods growing in the blood. They don’t have a full identification but tell you the
organism is a non-enteric non-lactose fermenter. Which of the following organisms could
be growing in JR’s blood?

a) Pseudomonas aeruginosa
b) Citrobacter freundii
c) Morganella morganii
d) Aeromonas hydrophila

Answer 18

a. pseudomonas aeruginosa

Question 19

Gram Positive Bacilli fall into what two categories?

Answer 19

Anaerobic

Aerobic

Question 20

Both anaerobic and aerobic, Gram Positive Bacilli fall into which two categories?

Answer 20

Spore Forming
Non-Spore Forming

Question 21

You have a Gram (+), Anaerobic, Bacilli that forms spores. What 2 bacteria could it be?

Answer 21

Clostridium spp.
Clostridium difficile

Question 22

You have a Gram (+), Anaerobic, Bacilli that does not form spores. What 2 bacteria could it be?

Answer 22

Cutibacterium
Actinomyces

Question 23

You have a Gram (+), Aerobic, Bacilli that forms spores. What bacteria is it?

Answer 23

Bacillus spp.

Question 24

You have a Gram (+), Aerobic, Bacilli that does not form spores. What 3 bacteria could it be?

Answer 24

Corynebacterium
Lactobacillus spp.
Listeria monocytogenes