Microbiology MCQs
Microbiology MCQs challenge students to identify pathogens, understand microbial physiology, and master infection control protocols. These questions span bacteriology, virology, mycology, parasitology, and immunology. Suitable for exams like MDCAT, FCPS, NTS, and USMLE, these quizzes improve both academic knowledge and clinical readiness.
Q: Lactobacillus helps in
A) Yogurt fermentation
B) Alcohol production
C) Disease causation
D) DNA synthesis
✅ Correct Answer: A
Explanation: Lactobacillus species are used in the fermentation of milk to produce yogurt.
Q: Pasteurization was developed to kill pathogens in
A) Milk
B) Soil
C) Air
D) Water
✅ Correct Answer: A
Explanation: Louis Pasteur introduced pasteurization to reduce microbial load in milk and other liquids.
Q: Bacteria reproduce by
A) Mitosis
B) Fragmentation
C) Binary fission
D) Budding
✅ Correct Answer: C
Explanation: Binary fission is a simple asexual division in bacteria producing identical daughter cells.
Q: Escherichia coli is a common
A) Protozoan
B) Gut bacterium
C) Pathogen
D) Virus
✅ Correct Answer: B
Explanation: E. coli is a facultative anaerobe that resides in the human gut and aids digestion.
Q: Antibiotic resistance is often spread via
A) Ribosomes
B) Plasmids
C) Flagella
D) Pili
✅ Correct Answer: B
Explanation: Plasmids carry genes for antibiotic resistance and can be transferred between bacteria.
Q: The bacterial capsule provides
A) Energy
B) Motility
C) Nutrients
D) Immune evasion
✅ Correct Answer: D
Explanation: Capsules prevent phagocytosis, aiding bacterial survival in host tissues.
Q: Mycology refers to the study of
A) Protozoa
B) Fungi
C) Bacteria
D) Algae
✅ Correct Answer: B
Explanation: Mycology is the branch of microbiology dealing with the study of fungi.
Q: Obligate anaerobes cannot survive in the presence of
A) Heat
B) Light
C) Oxygen
D) Salt
✅ Correct Answer: C
Explanation: Oxygen is toxic to obligate anaerobes due to the lack of protective enzymes.
Q: Gram-negative bacteria have a
A) No cell wall
B) Flagellated body
C) Lipid-rich outer membrane
D) Thick peptidoglycan wall
✅ Correct Answer: C
Explanation: Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane rich in lipopolysaccharides.