BIOD 171 ESSENTIAL MICROBIOLOGY MODULE 5 EXAM
QUESTIONS AND ANSWERS - P0RTAGE LEARNING
Mod 5
Exam Page 1
1. The concept of treating all samples, whether known or unknown, as potentially hazardous (or
pathogenic) materials is known as __________.
universal precaution
2. List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.
size/shape
motility
Gram status (positive or negative)
chemical reaction presence
Exam Page 2
1. 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 same
sample—the liquid sample cannot be divided. Which would you determine first and why?
presences of motility, because Gram staining would kill specimen
2. A facultative anaerobe is a microorganism capable of growth under what conditions?
can grow under both aerobic and anaerobic condition
A facultative anaerobe is capable of growth under aerobic (with oxygen) and anaerobic (without
oxygen) conditions.
Exam Page 3
1. True or False. The Lancefield groups are used to subdivide antigenic groups of alpha-
hemolytic Streptococcus.
False
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, 2. The distinctions for Lancefield subgroupings lie in its: (select all that apply)
A. Catalase activity
B. Carbohydrate composition of antigens
C. Hemolytic activity
D. All of the above
D
B. Carbohydrate composition of antigens present in the cell wall determines the Lancefield groupings
(A, B, C, etc). Note, ALL strep under Lancefield groupings are (by definition) catalase negative and beta-
hemolytic. Thus, answers A and C cannot be used to subdivide streptococcal species.
3. Rheumatic fever displays ______ hemolytic activity and occurs when _______ is left
untreated.
A. Beta; Strep. Pharyngitis
B. Gamma; Strep. Septicemia
C. Beta; Rheumatic fever
D. Alpha; Strep. Pharyngitis
A
Exam Page 4
1. True or False. Under most circumstances, staphylococcus can be found in ~80% of human
population where it remains non-symptomatic.
False
2. Define commensal bacteria.
a symbolic relationship between two or more bacteria that derives mutual benefit from a source
The bacterium neither harms nor benefits from the host from which it obtains nutrients.
3. How can Staphylococcus be differentially tested?
for the presences of bile salts
Exam Page 5
1. Match the following symptoms with their respective diseases:
1. Childhood skin disease near mouth/nose
A. Folliculitis
C
2. Infection of thin, transparent scleral tissue
B. Scalded-skin syndrome
D
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https://www.coursehero.com/file/63197427/Microbiology-Mod-5-Examdocx/
QUESTIONS AND ANSWERS - P0RTAGE LEARNING
Mod 5
Exam Page 1
1. The concept of treating all samples, whether known or unknown, as potentially hazardous (or
pathogenic) materials is known as __________.
universal precaution
2. List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.
size/shape
motility
Gram status (positive or negative)
chemical reaction presence
Exam Page 2
1. 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 same
sample—the liquid sample cannot be divided. Which would you determine first and why?
presences of motility, because Gram staining would kill specimen
2. A facultative anaerobe is a microorganism capable of growth under what conditions?
can grow under both aerobic and anaerobic condition
A facultative anaerobe is capable of growth under aerobic (with oxygen) and anaerobic (without
oxygen) conditions.
Exam Page 3
1. True or False. The Lancefield groups are used to subdivide antigenic groups of alpha-
hemolytic Streptococcus.
False
This study source was downloaded by 100000842568006 from CourseHero.com on 05-01-2022 02:40:59 GMT -05:00
https://www.coursehero.com/file/63197427/Microbiology-Mod-5-Examdocx/
, 2. The distinctions for Lancefield subgroupings lie in its: (select all that apply)
A. Catalase activity
B. Carbohydrate composition of antigens
C. Hemolytic activity
D. All of the above
D
B. Carbohydrate composition of antigens present in the cell wall determines the Lancefield groupings
(A, B, C, etc). Note, ALL strep under Lancefield groupings are (by definition) catalase negative and beta-
hemolytic. Thus, answers A and C cannot be used to subdivide streptococcal species.
3. Rheumatic fever displays ______ hemolytic activity and occurs when _______ is left
untreated.
A. Beta; Strep. Pharyngitis
B. Gamma; Strep. Septicemia
C. Beta; Rheumatic fever
D. Alpha; Strep. Pharyngitis
A
Exam Page 4
1. True or False. Under most circumstances, staphylococcus can be found in ~80% of human
population where it remains non-symptomatic.
False
2. Define commensal bacteria.
a symbolic relationship between two or more bacteria that derives mutual benefit from a source
The bacterium neither harms nor benefits from the host from which it obtains nutrients.
3. How can Staphylococcus be differentially tested?
for the presences of bile salts
Exam Page 5
1. Match the following symptoms with their respective diseases:
1. Childhood skin disease near mouth/nose
A. Folliculitis
C
2. Infection of thin, transparent scleral tissue
B. Scalded-skin syndrome
D
This study source was downloaded by 100000842568006 from CourseHero.com on 05-01-2022 02:40:59 GMT -05:00
https://www.coursehero.com/file/63197427/Microbiology-Mod-5-Examdocx/
