BIOS 24263778 Microbiology Variant
Exam 2 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A – Chamberlain
1. Which of the following bacteria is Gram-negative?
A. Staphylococcus aureus
B. Escherichia coli
C. Bacillus subtilis
D. Streptococcus pyogenes
Correct Answer: B
Rationale: Escherichia coli has a thin peptidoglycan layer and an
outer membrane, staining Gram-negative.
2. Which structure in bacteria is primarily responsible for
motility?
A. Capsule
B. Flagella
C. Pili
D. Cell wall
Correct Answer: B
Rationale: Flagella allow bacteria to move in liquid environments.
,3. Which microbial group is eukaryotic and unicellular?
A. Bacteria
B. Virus
C. Protozoa
D. Archaea
Correct Answer: C
Rationale: Protozoa are single-celled eukaryotes with a nucleus and
organelles.
4. Which microorganism is an obligate intracellular pathogen?
A. Escherichia coli
B. Chlamydia trachomatis
C. Bacillus anthracis
D. Staphylococcus aureus
Correct Answer: B
Rationale: Chlamydia cannot replicate outside host cells.
5. Which viral genome is RNA-based?
A. Adenovirus
B. Herpesvirus
C. Influenza virus
D. Papillomavirus
Correct Answer: C
Rationale: Influenza virus contains negative-sense RNA as its
genetic material.
,6. Which bacterial toxin is protein-based and secreted?
A. Endotoxin
B. Exotoxin
C. Lipopolysaccharide
D. Peptidoglycan
Correct Answer: B
Rationale: Exotoxins are secreted proteins that are highly potent
even in small amounts.
7. Which bacterial genus produces botulinum toxin?
A. Clostridium
B. Bacillus
C. Listeria
D. Salmonella
Correct Answer: A
Rationale: Clostridium botulinum produces a neurotoxin that
causes flaccid paralysis.
8. Which microbial structure allows bacteria to attach to surfaces
or host tissues?
A. Capsule
B. Flagella
C. Pili
D. Endospore
, Correct Answer: C
Rationale: Pili or fimbriae mediate adhesion to surfaces and host
cells.
9. Which fungal pathogen can cause systemic infection in
immunocompromised patients?
A. Candida albicans
B. Aspergillus fumigatus
C. Trichophyton
D. Microsporum
Correct Answer: B
Rationale: Aspergillus fumigatus can cause invasive disease in
immunocompromised individuals.
10. Which bacterial growth phase is characterized by maximum
cell division?
A. Lag phase
B. Log (exponential) phase
C. Stationary phase
D. Death phase
Correct Answer: B
Rationale: During the log phase, bacteria divide rapidly and
exponentially.
11. Which test differentiates Staphylococcus aureus from other
staphylococci?
Exam 2 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A – Chamberlain
1. Which of the following bacteria is Gram-negative?
A. Staphylococcus aureus
B. Escherichia coli
C. Bacillus subtilis
D. Streptococcus pyogenes
Correct Answer: B
Rationale: Escherichia coli has a thin peptidoglycan layer and an
outer membrane, staining Gram-negative.
2. Which structure in bacteria is primarily responsible for
motility?
A. Capsule
B. Flagella
C. Pili
D. Cell wall
Correct Answer: B
Rationale: Flagella allow bacteria to move in liquid environments.
,3. Which microbial group is eukaryotic and unicellular?
A. Bacteria
B. Virus
C. Protozoa
D. Archaea
Correct Answer: C
Rationale: Protozoa are single-celled eukaryotes with a nucleus and
organelles.
4. Which microorganism is an obligate intracellular pathogen?
A. Escherichia coli
B. Chlamydia trachomatis
C. Bacillus anthracis
D. Staphylococcus aureus
Correct Answer: B
Rationale: Chlamydia cannot replicate outside host cells.
5. Which viral genome is RNA-based?
A. Adenovirus
B. Herpesvirus
C. Influenza virus
D. Papillomavirus
Correct Answer: C
Rationale: Influenza virus contains negative-sense RNA as its
genetic material.
,6. Which bacterial toxin is protein-based and secreted?
A. Endotoxin
B. Exotoxin
C. Lipopolysaccharide
D. Peptidoglycan
Correct Answer: B
Rationale: Exotoxins are secreted proteins that are highly potent
even in small amounts.
7. Which bacterial genus produces botulinum toxin?
A. Clostridium
B. Bacillus
C. Listeria
D. Salmonella
Correct Answer: A
Rationale: Clostridium botulinum produces a neurotoxin that
causes flaccid paralysis.
8. Which microbial structure allows bacteria to attach to surfaces
or host tissues?
A. Capsule
B. Flagella
C. Pili
D. Endospore
, Correct Answer: C
Rationale: Pili or fimbriae mediate adhesion to surfaces and host
cells.
9. Which fungal pathogen can cause systemic infection in
immunocompromised patients?
A. Candida albicans
B. Aspergillus fumigatus
C. Trichophyton
D. Microsporum
Correct Answer: B
Rationale: Aspergillus fumigatus can cause invasive disease in
immunocompromised individuals.
10. Which bacterial growth phase is characterized by maximum
cell division?
A. Lag phase
B. Log (exponential) phase
C. Stationary phase
D. Death phase
Correct Answer: B
Rationale: During the log phase, bacteria divide rapidly and
exponentially.
11. Which test differentiates Staphylococcus aureus from other
staphylococci?
