Microbiology MCQs
Microbiology MCQs cover bacteriology, virology, mycology, parasitology, and immunology, testing pathogen identification, microbial physiology, and infection control. Ideal for MDCAT, FCPS, NTS, and USMLE preparation, these quizzes boost academic knowledge, clinical skills, and exam success.
Q: Pasteurization aims to
A) Kill all microorganisms
B) Reduce microbial load
C) Sterilize liquids
D) Remove spores
✅ Correct Answer: B
Explanation: Pasteurization reduces microbial load without eliminating all organisms, enhancing food safety.
Q: The Ziehl-Neelsen technique is used to detect
A) Endospore-forming bacteria
B) Spirochetes
C) Acid-fast bacteria
D) Gram-negative rods
✅ Correct Answer: C
Explanation: Acid-fast bacteria retain the red dye due to mycolic acid in their cell walls.
Q: Opportunistic infections commonly affect individuals who are
A) Physically active
B) Immunocompromised
C) Anemic
D) Overweight
✅ Correct Answer: B
Explanation: Opportunistic pathogens take advantage of weakened immune systems to cause disease.
Q: Infections acquired in a hospital setting are referred to as
A) Zoonotic infections
B) Nosocomial infections
C) Community-acquired infections
D) Endemic infections
✅ Correct Answer: B
Explanation: Nosocomial infections originate in healthcare facilities, often due to poor hygiene or invasive procedures.
Q: The bacterial genome is usually composed of
A) Linear DNA
B) Circular DNA
C) Double-stranded RNA
D) Multiple chromosomes
✅ Correct Answer: B
Explanation: Most bacteria have a single circular DNA molecule as their genetic material.