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: Hepatitis B is primarily transmitted via
A) Blood and body fluids
B) Fecal-oral route
C) Airborne droplets
D) Contaminated food
✅ Correct Answer: A
Explanation: Hepatitis B virus spreads through exposure to infected blood, sexual contact, and perinatal transmission.
Q: Flagella arrangement around the bacterial cell body is described as
A) Diplotrichous
B) Helicoidal
C) Biflagellar
D) Monotrichous
✅ Correct Answer: D
Explanation: Monotrichous flagella refer to a single flagellum located at one pole of a bacterial cell.
Q: Tuberculosis affects primarily the
A) Skin
B) Liver
C) Intestine
D) Lungs
✅ Correct Answer: D
Explanation: Mycobacterium tuberculosis most commonly infects the lungs, causing respiratory symptoms.
Q: A facultative anaerobe grows
A) With or without oxygen
B) Only with oxygen
C) Only without oxygen
D) Only in darkness
✅ Correct Answer: A
Explanation: Facultative anaerobes can survive in both aerobic and anaerobic conditions by switching metabolic pathways.
Q: An enzyme used in PCR derived from Thermus aquaticus is
A) Amylase
B) Taq polymerase
C) Reverse transcriptase
D) DNA polymerase
✅ Correct Answer: B
Explanation: Taq polymerase is a heat-stable enzyme used to amplify DNA in the polymerase chain reaction.