Microbiology Questions and Answers

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Q21
Which bacteria is responsible for typhoid fever?
  • A Shigella
  • B Salmonella typhi
  • C Vibrio cholerae
  • D E. coli
Answer: Option B
Explanation: Salmonella typhi is the causative agent of typhoid.
Q22
Which staining technique is used to differentiate bacterial types?
  • A Gram staining
  • B Endospore staining
  • C Acid-fast staining
  • D Negative staining
Answer: Option A
Explanation: Gram staining differentiates Gram-positive and Gram-negative bacteria.
Q23
Which bacteria is used in the production of insulin?
  • A Bacillus subtilis
  • B E. coli
  • C Lactobacillus
  • D Pseudomonas
Answer: Option B
Explanation: Recombinant E. coli is used in the production of human insulin.
Q24
Which bacteria is commonly used in sewage treatment?
  • A E. coli
  • B Pseudomonas
  • C Clostridium
  • D Streptococcus
Answer: Option B
Explanation: Pseudomonas species are used in biodegradation during sewage treatment.
Q25
Which scientist discovered penicillin?
  • A Robert Koch
  • B Alexander Fleming
  • C Joseph Lister
  • D Edward Jenner
Answer: Option B
Explanation: Alexander Fleming discovered penicillin in 1928.
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