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MCQs

Total Questions : 195 | Page 7 of 20 pages
Question 61. What is the frequency of defective phage particles in progeny phage produced?
  1.    100
  2.    10^-1
  3.    10^-5
  4.    1000
 Discuss Question
Answer: Option C. -> 10^-5
Answer: (c).10^-5
Question 62. How many percent of thr+ transducing phages also carry leu+?
  1.    10%
  2.    5%
  3.    3%
  4.    15%
 Discuss Question
Answer: Option C. -> 3%
Answer: (c).3%
Question 63. What is the correct order when coliphage P1 is grown in a thr+ leu+ aziR host is used to infect a thr- leu- azi- recipient bacterial cell?
  1.    thr+ leu+ aziR
  2.    thr– leu+ aziR
  3.    thr+ leu– aziR
  4.    thr– leu– aziR
 Discuss Question
Answer: Option A. -> thr+ leu+ aziR
Answer: (a).thr+ leu+ aziR
Question 64. When the phage transduces only those bacterial genes adjacent to the prophage in the bacterial chromosome then it is known as?
  1.    generalized transduction
  2.    specialized transduction
  3.    restricted transduction
  4.    conjugation
 Discuss Question
Answer: Option C. -> restricted transduction
Answer: (c).restricted transduction
Question 65. Fragments transferred by a bacteriophage contains how many genes?
  1.    20
  2.    50
  3.    1
  4.    100
 Discuss Question
Answer: Option D. -> 100
Answer: (d).100
Question 66. What are the characteristics of rough pneumococci strain?
  1.    noncapsulated and pathogenic
  2.    noncapsulated and nonpathogenic
  3.    capsulated and pathogenic
  4.    capsulated and nonpathogenic
 Discuss Question
Answer: Option B. -> noncapsulated and nonpathogenic
Answer: (b).noncapsulated and nonpathogenic
Question 67. We require cell-free DNA for transformation to take place.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 68. What should be the minimum weight of DNA that is required for successful transformation?
  1.    1000 daltons
  2.    100,000 daltons
  3.    300,000 daltons
  4.    8 million daltons
 Discuss Question
Answer: Option C. -> 300,000 daltons
Answer: (c).300,000 daltons
Question 69. In Griffith’s experiment which of the following strains of pneumococci was isolated from dead mice?
  1.    live rough cells
  2.    dead rough cells
  3.    live smooth cells
  4.    dead smooth cells
 Discuss Question
Answer: Option C. -> live smooth cells
Answer: (c).live smooth cells
Question 70. Which of the following things was identified as the transforming principle?
  1.    DNA
  2.    RNA
  3.    Proteins
  4.    Carbohydrates
 Discuss Question
Answer: Option A. -> DNA
Answer: (a).DNA

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