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: Antibiotics targeting cell wall synthesis are ineffective against
A) Gram-positive bacteria
B) Viruses
C) Fungi
D) Gram-negative bacteria
✅ Correct Answer: B
Explanation: Viruses lack cell walls, making antibiotics like penicillin ineffective against them.
Q: Streptococcus pyogenes is classified under
A) Spore-forming bacteria
B) Acid-fast rods
C) Gram-positive cocci
D) Gram-negative bacilli
✅ Correct Answer: C
Explanation: Streptococcus pyogenes is a Gram-positive coccus responsible for diseases such as strep throat.
Q: The vector responsible for transmitting Lyme disease is the
A) Flea
B) Louse
C) Tick
D) Mosquito
✅ Correct Answer: C
Explanation: Ticks carry Borrelia burgdorferi, the bacterium responsible for Lyme disease.
Q: The main component of the bacterial cell wall is
A) Chitin
B) Cellulose
C) Lipopolysaccharide
D) Peptidoglycan
✅ Correct Answer: D
Explanation: Peptidoglycan provides structural integrity to bacterial cell walls, especially in Gram-positive bacteria.
Q: Tetanus is caused by a toxin released by
A) Clostridium tetani
B) Vibrio cholerae
C) Bacillus anthracis
D) Escherichia coli
✅ Correct Answer: A
Explanation: Clostridium tetani produces a neurotoxin that causes muscular rigidity and spasms.