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: A pathogenic protozoan responsible for amoebic dysentery is
A) Trypanosoma brucei
B) Entamoeba histolytica
C) Giardia lamblia
D) Plasmodium vivax
✅ Correct Answer: B
Explanation: Entamoeba histolytica invades the intestinal lining, causing dysentery.
Q: Inactivation of microbes using high-frequency sound waves is known as
A) Radiation
B) Sonication
C) Desiccation
D) Filtration
✅ Correct Answer: B
Explanation: Sonication disrupts microbial cells by using ultrasonic vibrations.
Q: A selective medium allows growth of
A) Only specific microbes
B) All microorganisms
C) Only fungi
D) Only viruses
✅ Correct Answer: A
Explanation: Selective media contain agents that inhibit some organisms while allowing the growth of others.
Q: The causative agent of gas gangrene is
A) Clostridium perfringens
B) Staphylococcus aureus
C) Mycobacterium leprae
D) Pseudomonas aeruginosa
✅ Correct Answer: A
Explanation: Clostridium perfringens produces gas and toxins in necrotic tissue, leading to gas gangrene.
Q: Urease-producing bacteria can be detected using
A) Catalase test
B) Coagulase test
C) Urease test
D) TSI slant
✅ Correct Answer: C
Explanation: The urease test detects the production of ammonia by urease, leading to a color change in the medium.