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MCQs

Total Questions : 107 | Page 7 of 11 pages
Question 61. Number of hydrogen bonds between adenine and thymine?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 62. Which ratio is constant for DNA?
  1.    A + G / T + C
  2.    A + T / G + C
  3.    A + C / U + G
  4.    A + U / G + C
 Discuss Question
Answer: Option A. -> A + G / T + C
Answer: (a).A + G / T + C
Question 63. Which of the following leads to disruption of nucleosomal structure?
  1.    Acetylation
  2.    Carboxylation
  3.    Phosphorylation
  4.    Methylation
 Discuss Question
Answer: Option D. -> Methylation
Answer: (d).Methylation
Question 64. Which one of the following nucleic acids has a left handed helix?
  1.    M-RNA
  2.    T-RNA
  3.    A-DNA
  4.    Z-DNA
 Discuss Question
Answer: Option D. -> Z-DNA
Answer: (d).Z-DNA
Question 65. According to Chargaff’s rule, in a DNA molecule ____________
  1.    The amount of adenine and thymine is equal to the amount of guanine and cytosine
  2.    The amount of adenine and guanine is equal to the amount of thymine and cytosine
  3.    The amount of adenine and uracil is equal to the amount of guanine and cytosine
  4.    The amount of adenine and guanine is equal to the amount of uracil and cytosine
 Discuss Question
Answer: Option A. -> The amount of adenine and thymine is equal to the amount of guanine and cytosine
Answer: (a).The amount of adenine and thymine is equal to the amount of guanine and cytosine
Question 66. Arrangement of nucleotides in DNA can be seen by ____________
  1.    Ultracentrifuge
  2.    X-Ray crystallography
  3.    Light microscope
  4.    Electron microscope
 Discuss Question
Answer: Option B. -> X-Ray crystallography
Answer: (b).X-Ray crystallography
Question 67. Which pyrimidine base contains an amino group at carbon 4?
  1.    Uracil
  2.    Thymine
  3.    Cytosine
  4.    Adenine
 Discuss Question
Answer: Option C. -> Cytosine
Question 68. Nucleoside is a pyrimidine or purine base
  1.    None of these
  2.    covalently bonded to a sugar
  3.    ionically bonded to a sugar
  4.    hydrogen bonded to a sugar
 Discuss Question
Answer: Option B. -> covalently bonded to a sugar
Question 69. The sugar in RNA is __________ , the sugar in DNA is __________
  1.    ribose, phosphate
  2.    ribose, uracil
  3.    deoxyribose, ribose
  4.    ribose, deoxyribose
 Discuss Question
Answer: Option D. -> ribose, deoxyribose
Question 70. In gel electrophoresis, what fragments will move most quickly through a gel?
  1.    Large fragments
  2.    Large genome
  3.    None of these
  4.    Small fragments
 Discuss Question
Answer: Option D. -> Small fragments

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