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MCQs

Total Questions : 95 | Page 6 of 10 pages
Question 51. Spontaneous and permanent changes in DNA sequence are called
  1.    mutations
  2.    changes
  3.    deletions
  4.    translocations
 Discuss Question
Answer: Option A. -> mutations
Answer: (a).mutations
Question 52. Loose packaging of which of following makes DNA more accessible to transcription machinery?
  1.    clumped chromatin
  2.    diffused chromatin
  3.    Euchromatin
  4.    heterochromatin
 Discuss Question
Answer: Option C. -> Euchromatin
Answer: (c).Euchromatin
Question 53. Complex of DNA and proteins is called
  1.    chromosome
  2.    linker DNA
  3.    chromatin
  4.    nucleolus
 Discuss Question
Answer: Option C. -> chromatin
Answer: (c).chromatin
Question 54. Which of following play a part in DNA synthesis?
  1.    polymerase I
  2.    polymerase II
  3.    polymerase IV
  4.    polymerase V
 Discuss Question
Answer: Option A. -> polymerase I
Answer: (a).polymerase I
Question 55. In which of following cells activity of telomerase is abnormally high?
  1.    heart cells
  2.    cancer cells
  3.    muscle cells
  4.    none of above
 Discuss Question
Answer: Option B. -> cancer cells
Answer: (b).cancer cells
Question 56. How many phosphate groups are lost from DNA as each monomer joins?
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option A. -> 2
Answer: (a).2
Question 57. Telomeres from cells that have formed tumors have which of following quality?
  1.    unusually short
  2.    unusually long
  3.    same length
  4.    absent
 Discuss Question
Answer: Option A. -> unusually short
Answer: (a).unusually short
Question 58. Which of following is not a part of a DNA molecule
  1.    pentose sugar
  2.    nitrogenous base
  3.    ribose sugar
  4.    phosphate group
 Discuss Question
Answer: Option C. -> ribose sugar
Answer: (c).ribose sugar
Question 59. Why was purine-purine bonding theory not consistent with X-Ray diffraction data?
  1.    it was too wide
  2.    it was too narrow
  3.    purines cannot bond together
  4.    it would tilt sideways
 Discuss Question
Answer: Option A. -> it was too wide
Answer: (a).it was too wide
Question 60. Segments of DNA synthesized along lagging strand are called
  1.    replication fragment
  2.    okazaki fragments
  3.    lagging fragments
  4.    leading fragments
 Discuss Question
Answer: Option B. -> okazaki fragments
Answer: (b).okazaki fragments

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