BIOS 24263778 Microbiology Variant
Exam 1 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A – Chamberlain
1. Which of the following is a Gram-positive bacterium?
A. Escherichia coli
B. Staphylococcus aureus
C. Neisseria meningitidis
D. Pseudomonas aeruginosa
Correct Answer: B
Rationale: Staphylococcus aureus is Gram-positive due to its thick
peptidoglycan cell wall.
2. Which structure protects bacteria from phagocytosis?
A. Flagella
B. Capsule
C. Pili
D. Endospore
Correct Answer: B
Rationale: Capsules prevent recognition and ingestion by
phagocytes.
,3. Which of the following microbes produces endospores?
A. Bacillus anthracis
B. Escherichia coli
C. Staphylococcus aureus
D. Neisseria gonorrhoeae
Correct Answer: A
Rationale: Bacillus species form highly resistant endospores to
survive harsh conditions.
4. Which microbial growth phase is characterized by rapid
division?
A. Lag phase
B. Log (exponential) phase
C. Stationary phase
D. Death phase
Correct Answer: B
Rationale: During the log phase, bacteria divide at a constant and
rapid rate.
5. Which of the following is a characteristic of viruses?
A. They have a peptidoglycan cell wall
B. They are obligate intracellular parasites
C. They perform binary fission
D. They metabolize nutrients independently
,Correct Answer: B
Rationale: Viruses require a host cell to replicate, as they lack
metabolic machinery.
6. Which stain is used to identify acid-fast bacteria?
A. Gram stain
B. Ziehl-Neelsen stain
C. Endospore stain
D. Capsule stain
Correct Answer: B
Rationale: Acid-fast bacteria, such as Mycobacterium, retain carbol
fuchsin in Ziehl-Neelsen staining.
7. Which bacterial structure is used for motility?
A. Capsule
B. Flagella
C. Pili
D. Cell wall
Correct Answer: B
Rationale: Flagella allow bacterial movement in liquid
environments.
8. Which of the following is a fungal infection of the skin?
A. Candidiasis
B. Tinea pedis
, C. Histoplasmosis
D. Cryptococcosis
Correct Answer: B
Rationale: Tinea pedis (athlete’s foot) is a superficial fungal
infection caused by dermatophytes.
9. Which microorganism is prokaryotic?
A. Virus
B. Bacteria
C. Fungi
D. Protozoa
Correct Answer: B
Rationale: Bacteria are prokaryotes with no nucleus or membrane-
bound organelles.
10. Which of the following viruses contains RNA as its genetic
material?
A. Adenovirus
B. Herpesvirus
C. Influenza virus
D. Papillomavirus
Correct Answer: C
Rationale: Influenza virus is a negative-sense RNA virus.
Exam 1 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A – Chamberlain
1. Which of the following is a Gram-positive bacterium?
A. Escherichia coli
B. Staphylococcus aureus
C. Neisseria meningitidis
D. Pseudomonas aeruginosa
Correct Answer: B
Rationale: Staphylococcus aureus is Gram-positive due to its thick
peptidoglycan cell wall.
2. Which structure protects bacteria from phagocytosis?
A. Flagella
B. Capsule
C. Pili
D. Endospore
Correct Answer: B
Rationale: Capsules prevent recognition and ingestion by
phagocytes.
,3. Which of the following microbes produces endospores?
A. Bacillus anthracis
B. Escherichia coli
C. Staphylococcus aureus
D. Neisseria gonorrhoeae
Correct Answer: A
Rationale: Bacillus species form highly resistant endospores to
survive harsh conditions.
4. Which microbial growth phase is characterized by rapid
division?
A. Lag phase
B. Log (exponential) phase
C. Stationary phase
D. Death phase
Correct Answer: B
Rationale: During the log phase, bacteria divide at a constant and
rapid rate.
5. Which of the following is a characteristic of viruses?
A. They have a peptidoglycan cell wall
B. They are obligate intracellular parasites
C. They perform binary fission
D. They metabolize nutrients independently
,Correct Answer: B
Rationale: Viruses require a host cell to replicate, as they lack
metabolic machinery.
6. Which stain is used to identify acid-fast bacteria?
A. Gram stain
B. Ziehl-Neelsen stain
C. Endospore stain
D. Capsule stain
Correct Answer: B
Rationale: Acid-fast bacteria, such as Mycobacterium, retain carbol
fuchsin in Ziehl-Neelsen staining.
7. Which bacterial structure is used for motility?
A. Capsule
B. Flagella
C. Pili
D. Cell wall
Correct Answer: B
Rationale: Flagella allow bacterial movement in liquid
environments.
8. Which of the following is a fungal infection of the skin?
A. Candidiasis
B. Tinea pedis
, C. Histoplasmosis
D. Cryptococcosis
Correct Answer: B
Rationale: Tinea pedis (athlete’s foot) is a superficial fungal
infection caused by dermatophytes.
9. Which microorganism is prokaryotic?
A. Virus
B. Bacteria
C. Fungi
D. Protozoa
Correct Answer: B
Rationale: Bacteria are prokaryotes with no nucleus or membrane-
bound organelles.
10. Which of the following viruses contains RNA as its genetic
material?
A. Adenovirus
B. Herpesvirus
C. Influenza virus
D. Papillomavirus
Correct Answer: C
Rationale: Influenza virus is a negative-sense RNA virus.
