Microbiology Exam 5 Portage
Learning Questions and Answers
100% PASS
Define the concept of universal precautions.—ANSWER-The concept is any and all whether
known or unknown is treated hazardous.
List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.—ANSWER-1) size/shape
2) motility
3) change in color
While observing an unknown sample of limited amounts, a researcher must determine the
following observations: (1) the presence of any motility and (2) its Gram status using the
samesample—the liquid sample cannot be divided. Which would you determine first and
why?—ANSWER-Motility 1 because gram staining is required prior to killing the organism.
Gram stain the heat fixation kills it in process.
A facultative anaerobe is a microorganism capable of growth under what conditions?—
ANSWER-Both with and without oxygen.
, As Streptococcus is catalase negative would it thrive or die in the presence of peroxides?
Why?—ANSWER-Die because it is unable to breakdown peroxides. If left unchecked
peroxides would damage the cellular integrity of strep causing death.
Streptococcus is most often streaked onto:
Blood Agar
EMB Agar
Sprite Blue Agar
Chocolate Agar—ANSWER-Blood agar
The distinction for Lancefield subgroups lie in its (Select All that Apply)
A)Catlyse Activity
B)Carbohydrate composition of antigen
C)Hemotlyic Acitivty
D)All of the Above—ANSWER-B) Carbohydrate composition of antigen
True or False. The Lancefield groups are used to subdivide antigenic groups of alpha-
hemolytic Streptococcus.—ANSWER-False
Greater than 90% of all human streptococcal infections belong to:
Group A
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
Learning Questions and Answers
100% PASS
Define the concept of universal precautions.—ANSWER-The concept is any and all whether
known or unknown is treated hazardous.
List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.—ANSWER-1) size/shape
2) motility
3) change in color
While observing an unknown sample of limited amounts, a researcher must determine the
following observations: (1) the presence of any motility and (2) its Gram status using the
samesample—the liquid sample cannot be divided. Which would you determine first and
why?—ANSWER-Motility 1 because gram staining is required prior to killing the organism.
Gram stain the heat fixation kills it in process.
A facultative anaerobe is a microorganism capable of growth under what conditions?—
ANSWER-Both with and without oxygen.
, As Streptococcus is catalase negative would it thrive or die in the presence of peroxides?
Why?—ANSWER-Die because it is unable to breakdown peroxides. If left unchecked
peroxides would damage the cellular integrity of strep causing death.
Streptococcus is most often streaked onto:
Blood Agar
EMB Agar
Sprite Blue Agar
Chocolate Agar—ANSWER-Blood agar
The distinction for Lancefield subgroups lie in its (Select All that Apply)
A)Catlyse Activity
B)Carbohydrate composition of antigen
C)Hemotlyic Acitivty
D)All of the Above—ANSWER-B) Carbohydrate composition of antigen
True or False. The Lancefield groups are used to subdivide antigenic groups of alpha-
hemolytic Streptococcus.—ANSWER-False
Greater than 90% of all human streptococcal infections belong to:
Group A
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
