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MCQs

Total Questions : 137 | Page 12 of 14 pages
Question 111. For the selection of endospore-forming bacteria, a mixed culture can be heated at
  1.    90°C for 10 minutes
  2.    70°C for 10 minutes
  3.    80°C for 10 minutes
  4.    60°C for 10 minutes
 Discuss Question
Answer: Option C. -> 80°C for 10 minutes
Question 112. Which of the following bacteria dies quickly after drying?
  1.    Mycobacterium tuberculosis
  2.    Staphylococcus aureus
  3.    Pseudomonas aeruginosa
  4.    Treponema pallidium
 Discuss Question
Answer: Option D. -> Treponema pallidium
Question 113. Agar is used for solidifying culture media because
  1.    the melting and solidifying points of agar solution are not the same
  2.    it does not affect by the growth of bacteria
  3.    All of these
  4.    it does not add to the nutritive properties of the medium
 Discuss Question
Answer: Option C. -> All of these
Question 114. For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at
  1.    4.35
  2.    6.35
  3.    5.75
  4.    5.35
 Discuss Question
Answer: Option D. -> 5.35
Question 115. A disease producing species occurring in a mixed culture can often be selected on the basis of its
  1.    special carbon source
  2.    none of these
  3.    special nitrogen source
  4.    pathogenic properties
 Discuss Question
Answer: Option D. -> pathogenic properties
Question 116. Pseudomonas aeruginosa forms a blue water soluble pigment called
  1.    pyoverdin
  2.    chlororaphin
  3.    β-carotene
  4.    pyocyanin
 Discuss Question
Answer: Option D. -> pyocyanin
Question 117. Mac-Conkey medium is an example of
  1.    differential medium
  2.    enrichment medium
  3.    transport medium
  4.    all of these
 Discuss Question
Answer: Option A. -> differential medium
Question 118. Cell counting can be carried out by
  1.    membrane filter count
  2.    All of these
  3.    plate counting
  4.    direct microscopic count using petroffhansser counting chamber
 Discuss Question
Answer: Option B. -> All of these
Question 119. Important example(s) of enriched medium/media is/ are
  1.    Blood agar
  2.    Loeffler's serum slope
  3.    All of these
  4.    Bordet-gengou medium
 Discuss Question
Answer: Option C. -> All of these
Question 120. Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.
  1.    low levels of nitrogen
  2.    low concentration of various dyes
  3.    bile salts
  4.    sugars
 Discuss Question
Answer: Option C. -> bile salts

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