πŸ“Š Microbiology
Q. Coronavirus genome consists of
  • (A) Double-stranded DNA
  • (B) Double-stranded RNA
  • (C) Negative-sense single-stranded RNA
  • (D) Positive-sense single-stranded RNA
πŸ’¬ Discuss
βœ… Correct Answer: (D) Positive-sense single-stranded RNA
πŸ“Š Microbiology
Q. Which one of the following does not belong to the domain of Bacteria?
  • (A) Cyanobacteria
  • (B) Proteobacteria
  • (C) Bacteroids
  • (D) Methanobacterium
πŸ’¬ Discuss
βœ… Correct Answer: (D) Methanobacterium
πŸ“Š Microbiology
Q. Which one of the following organisms is responsible for crown gall disease in plants?
  • (A) Xanthomonas campestris
  • (B) Rhizobium etli
  • (C) Agrobacterium tumefaciens
  • (D) Erwinia stewartii
πŸ’¬ Discuss
βœ… Correct Answer: (C) Agrobacterium tumefaciens
πŸ“Š Microbiology
Q. Tetracycline inhibits the
  • (A) Interaction between tRNA and mRNA
  • (B) Translocation of mRNA through ribosome
  • (C) Peptidyl transferase activity
  • (D) Binding of amino-acyl tRNA to ribosome
πŸ’¬ Discuss
βœ… Correct Answer: (D) Binding of amino-acyl tRNA to ribosome
πŸ“Š Microbiology
Q. Which one of the following is an example of a neurotoxin?
  • (A) Cholera toxin
  • (B) Streptolysin-O
  • (C) Botulinum toxin
  • (D) Diphtheria toxin
πŸ’¬ Discuss
βœ… Correct Answer: (C) Botulinum toxin
πŸ“Š Microbiology
Q. Which one of the following is correct about microbial growth medium?
  • (A) Luria-Bertani broth is a synthetic medium
  • (B) Nutrient broth is a defined medium
  • (C) Sabouraud dextrose agar is a differential medium
  • (D) Trypticase soy agar is a complex medium
πŸ’¬ Discuss
βœ… Correct Answer: (D) Trypticase soy agar is a complex medium
πŸ“Š Microbiology
Q. Diphtheria toxin, tetracycline and streptomycin inhibit
  • (A) DNA repair
  • (B) DNA replication
  • (C) Transcription
  • (D) Translation
πŸ’¬ Discuss
βœ… Correct Answer: (D) Translation
πŸ“Š Microbiology
Q. Under stress conditions bacteria accumulate
  • (A) ppGpp (Goanosine tetraphosphate)
  • (B) pppGpp (Guanosine pentaphosphate)
  • (C) Both ppGpp and pppGpp
  • (D) Either ppGpp or pppGpp
πŸ’¬ Discuss
βœ… Correct Answer: (B) pppGpp (Guanosine pentaphosphate)
πŸ“Š Microbiology
Q. A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is
  • (A) 0.9
  • (B) 0.27
  • (C) 0.009
  • (D) 0.027
πŸ’¬ Discuss
βœ… Correct Answer: (D) 0.027
πŸ“Š Microbiology
Q. The most plausible explanation for a sudden increase of the respiratory quotient (RQ) of a microbial culture is that
  • (A) Cells are dying
  • (B) Yield of biomass is increasing
  • (C) The fermentation rate is increasing relative to respiration rate
  • (D) The maintenance rate is decreasing
πŸ’¬ Discuss
βœ… Correct Answer: (C) The fermentation rate is increasing relative to respiration rate

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