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MCQs

Total Questions : 108 | Page 6 of 11 pages
Question 51. . Reverse transcriptase produces
  1.    DNA from peptides
  2.    RNA from DNA
  3.    RNA from RNA
  4.    DNA from RNA
 Discuss Question
Answer: Option D. -> DNA from RNA
Question 52. . The nicks or gaps between Okazaki fragments are eventually sealed by
  1.    gyrase
  2.    DNA ligase
  3.    RNA ligase
  4.    polymerase
 Discuss Question
Answer: Option B. -> DNA ligase
Question 53. . 30 nm wide helix with five or six nucleosomes per helix is known as
  1.    solenoid
  2.    halonoid
  3.    kinoplast
  4.    none of these
 Discuss Question
Answer: Option A. -> solenoid
Question 54. . Nucleosome is
  1.    an octamer of four histones with H1 protein
  2.    an hexamer of three histones with H1 protein
  3.    an hexamer of three histones without H1 protein
  4.    an octamer of four histones without H1 protein
 Discuss Question
Answer: Option D. -> an octamer of four histones without H1 protein
Question 55. . In a typical electrophoresis experiment, larger fragments of DNA move more
  1.    slowly, so they appear nearer the top of a gel photograph
  2.    quickly, so they appear nearer the top of a gel photograph
  3.    slowly, so they appear nearer the bottom of a gel photograph
  4.    quickly, so they appear nearer the bottom of a gel photograph
 Discuss Question
Answer: Option A. -> slowly, so they appear nearer the top of a gel photograph
Question 56. . The DNA polymerase in bacteria, responsible for DNA synthesis is
  1.    Polymerase I
  2.    Polymerase II
  3.    Polymerase III
  4.    all of these
 Discuss Question
Answer: Option C. -> Polymerase III
Question 57. . DNA polymerases I also has
  1.    5'-3' exonuclease activity
  2.    3'-5'exonuclease activity
  3.    both (a) and (b)
  4.    5'-3' endonuclease activity
 Discuss Question
Answer: Option B. -> 3'-5'exonuclease activity
Question 58. . 
One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?
  1.    Conservative theory
  2.    Dispersive theory
  3.    Semi-conservative theory
  4.    Evolutionary theory
 Discuss Question
Answer: Option B. -> Dispersive theory
Question 59. . Without telomerase, what would happen to the ends of chromosomes after each round of replication?
  1.    Chromosomes would become progressively shorter
  2.    Nothing would happen
  3.    Chromosomes would get longer
  4.    none of the above
 Discuss Question
Answer: Option A. -> Chromosomes would become progressively shorter
Question 60. . The melting of 40-45 bp at the oriC site of E. coli requires
  1.    DNA + ATP + HU
  2.    DNA + ATP + HU + DNAb
  3.    DNA+ ATP + HU + DNAb + DNAa
  4.    DNA + ATP + HU + DNAb + DNAa + Pol III holoenzyme
 Discuss Question
Answer: Option A. -> DNA + ATP + HU

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