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MCQs

Total Questions : 101 | Page 5 of 11 pages
Question 41. In DNA replication, one new strand is synthesized complementary to an old (parent) strand and is referred as
  1.    discontinuous
  2.    mutational
  3.    antiparallel
  4.    semiconservative
 Discuss Question
Answer: Option D. -> semiconservative
Question 42. In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band
  1.    below DNA containing 14N
  2.    all of these
  3.    above DNA containing 14N
  4.    with 14N-containing DNA
 Discuss Question
Answer: Option A. -> below DNA containing 14N
Question 43. What is the approximate percentage of repetitive DNA sequences in human DNA?
  1.    20 to 30%
  2.    10 to 20%
  3.    40 to 50%
  4.    30 to 40%
 Discuss Question
Answer: Option A. -> 20 to 30%
Question 44. Deoxyribonucleoside triphosphates, being need in the chain termination methods are
  1.    all of these
  2.    dATP
  3.    dTTP
  4.    dGTP and dCTP
 Discuss Question
Answer: Option A. -> all of these
Question 45. The role of primase is to
  1.    cleave and unwinds short sections of DNA ahead of the replication fork
  2.    synthesize an RNA primer to begin the elongation process
  3.    proofread base pairing
  4.    dismantle RNA primer
 Discuss Question
Answer: Option B. -> synthesize an RNA primer to begin the elongation process
Question 46. The replication of a linear DNA molecule in a eukaryotic chromosome creates a problem which is reported to be sorted out by
  1.    shortening of the double stranded replicated portion
  2.    using RNA as a template
  3.    using enzyme called telomerase
  4.    None of these
 Discuss Question
Answer: Option C. -> using enzyme called telomerase
Question 47. The rapid appearance of HIV-1 strains that are resistant to AIDS drugs is due in part to which of the following property of its reverse transcriptase?
  1.    It has low affinity for the correct dNTP's
  2.    The RNase H domain of p66 causes error prone synthesis
  3.    AZT (zidovudine) is too expensive to be taken in effective doses
  4.    It lacks a proofreading exonuclease
 Discuss Question
Answer: Option D. -> It lacks a proofreading exonuclease
Question 48. The packing ratio of nucleosomes is about
  1.    8
  2.    7
  3.    9
  4.    6
 Discuss Question
Answer: Option B. -> 7
Question 49. Reverse transcriptase produces
  1.    RNA from RNA
  2.    RNA from DNA
  3.    DNA from peptides
  4.    DNA from RNA
 Discuss Question
Answer: Option D. -> DNA from RNA
Question 50. After one replication in 15N, how many bands should be observed in a cesium chloride gradient?
  1.    Three
  2.    A smear
  3.    Two
  4.    One
 Discuss Question
Answer: Option D. -> One

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