BIOD 171 ESSENTIAL MICROBIOLOGY
MODULE 005 COMPREHENSIVE EXAM
GENAVA COLLEGE
PORTAGE LEARNING
ACTUAL VERIFIED QUESTIONS AND REVISED ANSWERS
,THIS DOCUMENT CONSISTS OF THE FOLLOWING:
Module 5 Exam
True & False Questions
Multiple Choice Questions and Answers
Clear images
Expert-Verified Explanations
, BIOD 171 MODULE 005 COMPREHENSIVE
TEST
1. The concept of treating all samples, whether known or unknown, as potentially hazardous (or
pathogenic) materials is known as _____.
Correct Answer: Universal Precautions
Expert Rationale:
Universal Precautions are an infection control approach developed to treat all human blood and certain
human body fluids as infectious, regardless of the perceived status of the source individual. This approach
minimizes risk of exposure to bloodborne pathogens and is critical for laboratory and clinical safety.
---
2. Define the concept of universal precautions.
Answer choices:
Correct Answer: . Treat all samples, whether identified or unidentified, as potentially hazardous or
pathogenic materials.
Expert Rationale:
Universal precautions require that all biological samples are handled with equal caution because the
infective status may be unknown. This protective principle ensures worker and public safety by assuming
the presence of infectious agents in any specimen.
---
3. List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.
Answer choices:
A. Antibiotic resistance, spore formation, pH tolerance
, B. Size and shape, observable motility, Gram status, color change, chemical reactions
C. Viral morphology, nucleic acid type, host range
D. Oxygen requirement, pathogenicity, toxin production
Correct Answer: B. Size and shape, observable motility, Gram status, color change, chemical reactions
Expert Rationale:
Initial morphological and biochemical observations provide essential clues to microbial identity and
classification. Assessing size, shape, motility, Gram reaction, and biochemical activity allows
microbiologists to narrow down potential species before molecular confirmation.
---
4. While observing an unknown sample of limited amounts, a researcher must determine the
following observations: (1) the presence of motility and (2) its Gram status using the same sample -
the liquid sample cannot be divided. Which would you determine first and why?
Answer choices:
A. Gram stain first, then motility test, because Gram stain differentiates cell wall type.
B. Motility first, then Gram stain, because heat fixation in Gram stain kills motile organisms.
C. Either one can be done first; results do not interfere.
D. Neither test can be performed with limited sample.
Correct Answer: B. Motility first, then Gram stain, because heat fixation in Gram stain kills motile
organisms.
Expert Rationale:
Motility must be assessed on live, unfixed specimens (wet mounts) because heat fixation (used in Gram
staining) kills cells and prevents observation of motile activity. Starting with motility preserves critical
functional information before processing the fixed Gram stain for cell wall analysis.
---
5. A facultative anaerobe is a microorganism capable of growth under what conditions?
Answer choices:
A. Only in the absence of oxygen (anaerobic conditions)
MODULE 005 COMPREHENSIVE EXAM
GENAVA COLLEGE
PORTAGE LEARNING
ACTUAL VERIFIED QUESTIONS AND REVISED ANSWERS
,THIS DOCUMENT CONSISTS OF THE FOLLOWING:
Module 5 Exam
True & False Questions
Multiple Choice Questions and Answers
Clear images
Expert-Verified Explanations
, BIOD 171 MODULE 005 COMPREHENSIVE
TEST
1. The concept of treating all samples, whether known or unknown, as potentially hazardous (or
pathogenic) materials is known as _____.
Correct Answer: Universal Precautions
Expert Rationale:
Universal Precautions are an infection control approach developed to treat all human blood and certain
human body fluids as infectious, regardless of the perceived status of the source individual. This approach
minimizes risk of exposure to bloodborne pathogens and is critical for laboratory and clinical safety.
---
2. Define the concept of universal precautions.
Answer choices:
Correct Answer: . Treat all samples, whether identified or unidentified, as potentially hazardous or
pathogenic materials.
Expert Rationale:
Universal precautions require that all biological samples are handled with equal caution because the
infective status may be unknown. This protective principle ensures worker and public safety by assuming
the presence of infectious agents in any specimen.
---
3. List at least 3 observations a researcher would be sure to note while assessing an unknown
microbial sample.
Answer choices:
A. Antibiotic resistance, spore formation, pH tolerance
, B. Size and shape, observable motility, Gram status, color change, chemical reactions
C. Viral morphology, nucleic acid type, host range
D. Oxygen requirement, pathogenicity, toxin production
Correct Answer: B. Size and shape, observable motility, Gram status, color change, chemical reactions
Expert Rationale:
Initial morphological and biochemical observations provide essential clues to microbial identity and
classification. Assessing size, shape, motility, Gram reaction, and biochemical activity allows
microbiologists to narrow down potential species before molecular confirmation.
---
4. While observing an unknown sample of limited amounts, a researcher must determine the
following observations: (1) the presence of motility and (2) its Gram status using the same sample -
the liquid sample cannot be divided. Which would you determine first and why?
Answer choices:
A. Gram stain first, then motility test, because Gram stain differentiates cell wall type.
B. Motility first, then Gram stain, because heat fixation in Gram stain kills motile organisms.
C. Either one can be done first; results do not interfere.
D. Neither test can be performed with limited sample.
Correct Answer: B. Motility first, then Gram stain, because heat fixation in Gram stain kills motile
organisms.
Expert Rationale:
Motility must be assessed on live, unfixed specimens (wet mounts) because heat fixation (used in Gram
staining) kills cells and prevents observation of motile activity. Starting with motility preserves critical
functional information before processing the fixed Gram stain for cell wall analysis.
---
5. A facultative anaerobe is a microorganism capable of growth under what conditions?
Answer choices:
A. Only in the absence of oxygen (anaerobic conditions)
