Microbiology (Blue PACOP) Questions
and Answers | Latest Version |
2025/2026 | Correct & Verified
Which staining technique is used to differentiate Gram-positive from Gram-negative bacteria?
✔✔ a. Gram stain
b. Acid-fast stain
c. Endospore stain
d. Capsule stain
Which bacterium is Gram-positive and causes food poisoning through toxin production?
a. Escherichia coli
✔✔ b. Staphylococcus aureus
c. Salmonella typhi
d. Pseudomonas aeruginosa
Which organism is an acid-fast bacillus associated with tuberculosis?
a. Staphylococcus aureus
✔✔ b. Mycobacterium tuberculosis
1
,c. Bacillus cereus
d. Clostridium perfringens
Which structure protects bacteria from phagocytosis and desiccation?
✔✔ a. Capsule
b. Flagella
c. Pilus
d. Endospore
What is the primary purpose of bacterial endospores?
a. Nutrition storage
b. Motility
✔✔ c. Survival under harsh conditions
d. DNA replication
Which microorganism is a common cause of urinary tract infections?
✔✔ a. Escherichia coli
b. Bacillus subtilis
2
,c. Staphylococcus epidermidis
d. Clostridium tetani
Which of the following bacteria is responsible for whooping cough?
a. Streptococcus pyogenes
✔✔ b. Bordetella pertussis
c. Haemophilus influenzae
d. Mycobacterium leprae
Which medium is selective for Gram-negative enteric bacteria?
✔✔ a. MacConkey agar
b. Blood agar
c. Mannitol salt agar
d. Chocolate agar
Which microorganism forms spores and causes tetanus?
a. Staphylococcus aureus
✔✔ b. Clostridium tetani
3
, c. Bacillus anthracis
d. Escherichia coli
Which bacterium is responsible for diphtheria?
✔✔ a. Corynebacterium diphtheriae
b. Listeria monocytogenes
c. Clostridium botulinum
d. Vibrio cholerae
Which test differentiates Staphylococcus aureus from other Staphylococcus species?
a. Catalase test
✔✔ b. Coagulase test
c. Oxidase test
d. Indole test
Which bacteria are known for producing endotoxins?
✔✔ a. Gram-negative bacteria
b. Gram-positive bacteria
4
and Answers | Latest Version |
2025/2026 | Correct & Verified
Which staining technique is used to differentiate Gram-positive from Gram-negative bacteria?
✔✔ a. Gram stain
b. Acid-fast stain
c. Endospore stain
d. Capsule stain
Which bacterium is Gram-positive and causes food poisoning through toxin production?
a. Escherichia coli
✔✔ b. Staphylococcus aureus
c. Salmonella typhi
d. Pseudomonas aeruginosa
Which organism is an acid-fast bacillus associated with tuberculosis?
a. Staphylococcus aureus
✔✔ b. Mycobacterium tuberculosis
1
,c. Bacillus cereus
d. Clostridium perfringens
Which structure protects bacteria from phagocytosis and desiccation?
✔✔ a. Capsule
b. Flagella
c. Pilus
d. Endospore
What is the primary purpose of bacterial endospores?
a. Nutrition storage
b. Motility
✔✔ c. Survival under harsh conditions
d. DNA replication
Which microorganism is a common cause of urinary tract infections?
✔✔ a. Escherichia coli
b. Bacillus subtilis
2
,c. Staphylococcus epidermidis
d. Clostridium tetani
Which of the following bacteria is responsible for whooping cough?
a. Streptococcus pyogenes
✔✔ b. Bordetella pertussis
c. Haemophilus influenzae
d. Mycobacterium leprae
Which medium is selective for Gram-negative enteric bacteria?
✔✔ a. MacConkey agar
b. Blood agar
c. Mannitol salt agar
d. Chocolate agar
Which microorganism forms spores and causes tetanus?
a. Staphylococcus aureus
✔✔ b. Clostridium tetani
3
, c. Bacillus anthracis
d. Escherichia coli
Which bacterium is responsible for diphtheria?
✔✔ a. Corynebacterium diphtheriae
b. Listeria monocytogenes
c. Clostridium botulinum
d. Vibrio cholerae
Which test differentiates Staphylococcus aureus from other Staphylococcus species?
a. Catalase test
✔✔ b. Coagulase test
c. Oxidase test
d. Indole test
Which bacteria are known for producing endotoxins?
✔✔ a. Gram-negative bacteria
b. Gram-positive bacteria
4
