Question 1

Colony morphology is defined as:

Accepted Answer

A)   Colony characteristics and form
B)   Colony size and color
C)   Colony smell and shape
D)   Colony constitution and environmental conditionsE) A) and B)
F) A) and C)

Question 2

When microbiologists encounter a sputum specimen,they know that the upper respiratory tract contains many indigenous organisms and to identify every organism in the culture would be a time-consuming,cost-prohibitive,and insurmountable task.So microbiologists must:

Accepted Answer

A)   Work quickly with commercially available kits to identify all organisms present in a sputum specimen for the best quality patient care available.
B)   Work up only the gram-negative rods present in the culture.
C)   Differentiate the potential pathogens from the "usual" inhabitants of the upper respiratory tract and direct the diagnostic workup only to potential pathogens.
D)   Be able to ascertain whether the results generated by a commercial or automated system correlate with the suspected organism.E) All of the above
F) A) and C)

Question 3

The colonies of this organism form large,rough,greenish,hemolytic colonies on blood agar.What organism is it?

Accepted Answer

A)   Staphylococcus aureus
B)   Escherichia coli
C)   Streptococcus pyogenes
D)   Bacillus cereusE) A) and B)
F) A) and C)

Question 4

A technician is reading a vaginal culture on the bench.There is growth on the sheep blood agar (SBA) and chocolate (CHOC) plates,but no growth on the MacConkey (MAC) plate.The colonies growing on the SBA have produced a narrow,diffuse zone of b-hemolysis around and under the colonies.What organism could this be?

Accepted Answer

A)   Escherichia coli
B)   Streptococcus agalactiae
C)   Streptococcus pyogenes
D)   Streptococcus pneumoniaeE) C) and D)
F) A) and B)

Question 5

A technician is reading a sputum culture on the bench.There is growth on the sheep blood agar (SBA) and chocolate (CHOC) plates,but no growth on the MacConkey (MAC) plate.The colonies growing on the SBA have produced a wide,deep,clear zone of b-hemolysis around and under the colonies.What organism could this be?

Accepted Answer

A)   Escherichia coli
B)   Staphylococcus aureus
C)   Streptococcus pyogenes
D)   Streptococcus pneumoniaeE) None of the above
F) B) and C)

Question 6

Colonies of Bacillus anthracis are described as:

Accepted Answer

A)   Curschmann's spiral
B)   Mickey Mouse ears
C)   Medusa's heads
D)   Flower likeE) None of the above
F) B) and C)

Question 7

All of the following characteristics are used to describe bacterial colony characteristics EXCEPT:

Accepted Answer

A)   Temperature
B)   Hemolysis
C)   Color
D)   ElevationE) A) and B)
F) A) and C)

Question 8

All the following colors are commonly used to describe bacteria EXCEPT:

Accepted Answer

A)   Buff
B)   White
C)   Orange
D)   GrayE) A) and B)
F) A) and C)

Question 9

A technician is reading the plates from a sputum culture.The culture is from a patient with cystic fibrosis.One organism dominates the blood agar,chocolate,and MacConkey plates.The MacConkey plate shows an organism with a green pigment and a metallic sheen.The probable identification for this organism is:

Accepted Answer

A)   Pseudomonas aeruginosa
B)   Serratia marcescens
C)   Chromobacterium violaceum
D)   Prevotella melaninogenicaE) A) and C)
F) C) and D)

Question 10

Streptococcus pneumoniae typically produces colonies that are said to resemble coins.The technical term for this colony shape is:

Accepted Answer

A)   Umbonate
B)   Flat
C)   Umbilicate
D)   RaisedE) None of the above
F) B) and C)

Question 11

Colonies of Staphylococcus aureus are usually described as:

Accepted Answer

A)   Opaque
B)   Transparent
C)   Translucent
D)   Ground glassE) None of the above
F) B) and C)

Question 12

A technician is reading a sputum culture on the bench.There is growth on the BAP and CHOC plates,but no growth on the MAC plate.The colonies growing on the BAP have discolored the media to a green color around and under the colonies.What organism could this be?

Accepted Answer

A)   Escherichia coli
B)   Staphylococcus aureus
C)   Haemophilus influenzae
D)   Streptococcus pneumoniaeE) A) and B)
F) A) and C)

Question 13

A technician is reading stool culture plates.She is looking for enteric pathogens on the MacConkey (MAC) plate.What do they look like?

Accepted Answer

A)   Clear, colorless colonies
B)   Large, bright pink colonies
C)   Small, mucoid, green colonies
D)   Small, orange coloniesE) A) and B)
F) A) and C)

Question 14

a-Hemolysis is:

Accepted Answer

A)   Complete clearing of erythrocytes in a blood agar plate around and under the colony
B)   Partial lysing of erythrocytes in a blood agar plate around and under the colony
C)   When organisms have no lytic effect on the erythrocytes in the blood agar plate
D)   A pink "halo" around a colonyE) All of the above
F) A) and D)

Question 15

What organism forms a small,fuzzy-edged colony with an umbonate center on blood or chocolate agar?

Accepted Answer

A)   Eikenella corrodens
B)   Staphylococcus aureus
C)   Escherichia coli
D)   Streptococcus pyogenesE) B) and C)
F) A) and D)

Question 16

This bacteria is said to have a fruity or grapelike smell.

Accepted Answer

A)   Staphylococcus aureus
B)   Proteus mirabilis
C)   Pseudomonas aeruginosa
D)   Nocardia sp.E) A) and B)
F) B) and D)

Question 17

Swarming is:

Accepted Answer

A)   Many bacterial colonies crowded together at one place on the agar plate
B)   When colonies on a blood agar plate have a "halo" around the bacterial colony
C)   When a bacterial colony on a blood agar plate grows over the top of the erythrocytes it hemolyzed
D)   A hazy blanket of growth on the surface of the agar that extends way beyond the streak linesE) A) and D)
F) A) and C)

Exam 8: Use of Colonial Morphology for the Presumptive Identification of Microorganisms

Streptococcus pneumoniae typically produces colonies that are said to resemble coins.The technical term for this colony shape is:

Correct Answer
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All of the following characteristics are used to describe bacterial colony characteristics EXCEPT:

Correct Answer
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The colonies of this organism form large,rough,greenish,hemolytic colonies on blood agar.What organism is it?

Correct Answer
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Swarming is:

Correct Answer
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This bacteria is said to have a fruity or grapelike smell.

Correct Answer
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Colonies of Bacillus anthracis are described as:

Correct Answer
verified

When microbiologists encounter a sputum specimen,they know that the upper respiratory tract contains many indigenous organisms and to identify every organism in the culture would be a time-consuming,cost-prohibitive,and insurmountable task.So microbiologists must:

Correct Answer
verified

a-Hemolysis is:

Correct Answer
verified

Correct Answer
verified

All the following colors are commonly used to describe bacteria EXCEPT:

Correct Answer
verified

A technician is reading stool culture plates.She is looking for enteric pathogens on the MacConkey (MAC) plate.What do they look like?

Correct Answer
verified

A technician is reading a sputum culture on the bench.There is growth on the BAP and CHOC plates,but no growth on the MAC plate.The colonies growing on the BAP have discolored the media to a green color around and under the colonies.What organism could this be?

Correct Answer
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Colonies of Staphylococcus aureus are usually described as:

Correct Answer
verified

Correct Answer
verified

Colony morphology is defined as:

Correct Answer
verified

What organism forms a small,fuzzy-edged colony with an umbonate center on blood or chocolate agar?

Correct Answer
verified

Correct Answer
verified

Exam 8: Use of Colonial Morphology for the Presumptive Identification of Microorganisms

Streptococcus pneumoniae typically produces colonies that are said to resemble coins.The technical term for this colony shape is:

Correct AnswerverifiedShow Answer

All of the following characteristics are used to describe bacterial colony characteristics EXCEPT:

Correct AnswerverifiedShow Answer

The colonies of this organism form large,rough,greenish,hemolytic colonies on blood agar.What organism is it?

Correct AnswerverifiedShow Answer

Swarming is:

Correct AnswerverifiedShow Answer

This bacteria is said to have a fruity or grapelike smell.

Correct AnswerverifiedShow Answer

Colonies of Bacillus anthracis are described as:

Correct AnswerverifiedShow Answer

When microbiologists encounter a sputum specimen,they know that the upper respiratory tract contains many indigenous organisms and to identify every organism in the culture would be a time-consuming,cost-prohibitive,and insurmountable task.So microbiologists must:

Correct AnswerverifiedShow Answer

a-Hemolysis is:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All the following colors are commonly used to describe bacteria EXCEPT:

Correct AnswerverifiedShow Answer

A technician is reading stool culture plates.She is looking for enteric pathogens on the MacConkey (MAC) plate.What do they look like?

Correct AnswerverifiedShow Answer

A technician is reading a sputum culture on the bench.There is growth on the BAP and CHOC plates,but no growth on the MAC plate.The colonies growing on the BAP have discolored the media to a green color around and under the colonies.What organism could this be?

Correct AnswerverifiedShow Answer

Colonies of Staphylococcus aureus are usually described as:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Colony morphology is defined as:

Correct AnswerverifiedShow Answer

What organism forms a small,fuzzy-edged colony with an umbonate center on blood or chocolate agar?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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