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: Leprosy is caused by
A) Mycobacterium tuberculosis
B) Clostridium botulinum
C) Treponema pallidum
D) Mycobacterium leprae
✅ Correct Answer: D
Explanation: Mycobacterium leprae infects peripheral nerves and skin, leading to chronic granulomatous disease known as leprosy.
Q: The acid produced by Lactobacillus during fermentation is
A) Butyric acid
B) Citric acid
C) Acetic acid
D) Lactic acid
✅ Correct Answer: D
Explanation: Lactobacillus ferments sugars into lactic acid, which is used in food preservation and digestion.
Q: The presence of bacterial endotoxins can be tested using the
A) VDRL test
B) Catalase test
C) Coagulase test
D) Limulus amoebocyte lysate test
✅ Correct Answer: D
Explanation: The LAL test detects endotoxins using the blood cells of horseshoe crabs, which clot in the presence of endotoxins.
Q: Transmission of rabies occurs primarily through
A) Airborne droplets
B) Fecal contamination
C) Infected animal bites
D) Insect vectors
✅ Correct Answer: C
Explanation: Rabies virus is transmitted through saliva via bites or scratches from infected animals.
Q: Staphylococcus aureus can be identified by a positive
A) Coagulase test
B) Oxidase test
C) Catalase test
D) Urease test
✅ Correct Answer: A
Explanation: The coagulase test differentiates Staphylococcus aureus from other staphylococci by its ability to clot plasma.