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Dear candidates you will find MCQ questions of Microbiology here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

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Q. 1) Coronavirus genome consists of

(A) Double-stranded DNA
(B) Double-stranded RNA
(C) Negative-sense single-stranded RNA
(D) Positive-sense single-stranded RNA
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Q. 2) Which one of the following does not belong to the domain of Bacteria?

(A) Cyanobacteria
(B) Proteobacteria
(C) Bacteroids
(D) Methanobacterium
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Mr. Dubey • 51.27K Points
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Q. 3) 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
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Mr. Dubey • 51.27K Points
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Q. 4) 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
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Mr. Dubey • 51.27K Points
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Q. 5) Which one of the following is an example of a neurotoxin?

(A) Cholera toxin
(B) Streptolysin-O
(C) Botulinum toxin
(D) Diphtheria toxin
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Mr. Dubey • 51.27K Points
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Q. 6) 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
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Q. 7) Diphtheria toxin, tetracycline and streptomycin inhibit

(A) DNA repair
(B) DNA replication
(C) Transcription
(D) Translation
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Q. 8) Under stress conditions bacteria accumulate

(A) ppGpp (Goanosine tetraphosphate)
(B) pppGpp (Guanosine pentaphosphate)
(C) Both ppGpp and pppGpp
(D) Either ppGpp or pppGpp
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Q. 9) 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
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Q. 10) 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
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