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: Binary fission in bacteria leads to
A) Genetic recombination
B) Sexual reproduction
C) Spore formation
D) Asexual reproduction
✅ Correct Answer: D
Explanation: Binary fission is an asexual process where a single bacterium divides into two identical daughter cells.
Q: The gram-negative cell wall contains
A) Teichoic acids
B) Lipopolysaccharide layer
C) Mycolic acid
D) Thick peptidoglycan
✅ Correct Answer: B
Explanation: Gram-negative bacteria have an outer membrane rich in lipopolysaccharides which contributes to pathogenicity.
Q: An example of a dimorphic fungus is
A) Mucor
B) Aspergillus niger
C) Cryptococcus neoformans
D) Candida albicans
✅ Correct Answer: D
Explanation: Candida albicans can exist in both yeast and filamentous forms, making it dimorphic.
Q: The function of pili in bacteria is to
A) Aid in attachment
B) Facilitate movement
C) Break down toxins
D) Protect against antibiotics
✅ Correct Answer: A
Explanation: Pili are hair-like structures that help bacteria attach to host tissues or surfaces.
Q: The term “acid-fast” refers to organisms that
A) Lose the primary stain easily
B) Are sensitive to acid
C) Retain stain after acid-alcohol wash
D) Live in acidic environments
✅ Correct Answer: C
Explanation: Acid-fast organisms resist decolorization due to the high lipid content in their cell walls.