Module Two Pre-assessment

Question 1

A Gram Stain examination of a specimen cannot give a quick way of presumptively identifying possible causative agents of infectious diseases.

Answer 1

False

Gram Staining can give us our first clue of the possibility of microbes causing infection.

Question 2

A specimen not collected in the proper manner can be a criterion to reject the specimen in a micro clinical lab.

Answer 2

True

All specimens sent to micro must be collected in the proper manner and placed in a sterile container in order to avoid the recovery of contaminating organisms and to aid in the recovery of the probable causative organisms.

Question 3

Pink colonies on a MacConkey Agar indicate a Gram-pos organism that is also a lactose fermenter

Answer 3

False

MacConkey Agar only supports the growth of Gram-negative organisms. Pink colonies that grow on MacConkey indicate a Gram-negative organism that is able to ferment lactose.

Question 4

Beta hemolysis is described as complete hemolysis of the red blood cells in blood agar media.

Answer 4

True

Beta hemolysis is the complete lysis of red blood cells around the colonies that grow on blood agar plates. It shows as a complete clear zone around the colonies.

Question 5

A “swarming” of the colonies on a blood agar plate can be indicative of Proteus spp.

Answer 5

True

Question 6

Chocolate agar is an example of selective media.

Answer 6

False

Chocolate agar is enriched media as it promotes growth to fastidious organisms such as Hemophilus spp.

Question 7

A sputum specimen with many epithelial cells is an acceptable sample for culture.

Answer 7

False

Sputum specimens that are suitable for culture should generally have less than 10 epithelial cells per lpf.