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: Sterilization ensures
A) Reduction in microbial count
B) Destruction of all microbial life
C) Removal of dust
D) Killing of pathogens only
✅ Correct Answer: B
Explanation: Sterilization completely eliminates all forms of microbial life, including spores.
Q: Penicillin was discovered by
A) Alexander Fleming
B) Joseph Lister
C) Robert Koch
D) Louis Pasteur
✅ Correct Answer: A
Explanation: Alexander Fleming discovered penicillin, the first widely used antibiotic, in 1928.
Q: A capsule in bacteria functions to
A) Increase nutrient uptake
B) Synthesize proteins
C) Aid motility
D) Evade immune response
✅ Correct Answer: D
Explanation: The bacterial capsule helps prevent phagocytosis by host immune cells, enhancing pathogenicity.
Q: Plasmids in bacteria are
A) Extrachromosomal DNA
B) RNA fragments
C) Structural components
D) Sites of protein synthesis
✅ Correct Answer: A
Explanation: Plasmids are circular DNA molecules that often carry antibiotic resistance or virulence genes.
Q: Obligate aerobes require
A) High temperatures
B) Low pH
C) Oxygen for survival
D) Carbon dioxide
✅ Correct Answer: C
Explanation: Obligate aerobes depend on oxygen for energy production via aerobic respiration.