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MCQs

Total Questions : 65 | Page 6 of 7 pages
Question 51. . Transcription begins
  1.    at the start codon
  2.    upstream from the start codon
  3.    downstream from the start codon
  4.    none of these
 Discuss Question
Answer: Option B. -> upstream from the start codon
Question 52. . The closed complex at bacterial promoters is
  1.    in equilibrium with free RNA polymerase and the promoter
  2.    not affected by promoter mutations
  3.    bound more tightly when repressors are present
  4.    not affected by activator proteins
 Discuss Question
Answer: Option A. -> in equilibrium with free RNA polymerase and the promoter
Question 53. . RNA polymerase holoenzyme initiates transcription which involves
  1.    recognition of the -10 sequence and -35 sequence
  2.    recognition of the -10 sequence only
  3.    recognition of the -35 sequence only
  4.    none of the above
 Discuss Question
Answer: Option A. -> recognition of the -10 sequence and -35 sequence
Question 54. . Transcription results in
  1.    an amino acid chain
  2.    messenger RNA
  3.    complementary DNA
  4.    Okazaki fragments
 Discuss Question
Answer: Option B. -> messenger RNA
Question 55. . The transcriptional regulatory proteins in eukaryotes which induce transcription usually have
  1.    at least two distinct domains of protein structure, a DNA binding domain and an activation domain
  2.    at least two distinct domains of protein structure and a DNA binding domain
  3.    at least one distinct domains of protein structure, a DNA binding domain and an activation domain
  4.    none of these
 Discuss Question
Answer: Option A. -> at least two distinct domains of protein structure, a DNA binding domain and an activation domain
Question 56. . The nucleons of eukaryotic cell has
  1.    RNA polymerase I
  2.    RNA polymerase II
  3.    RNA polymerase III
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 57. . In prokaryotes, transcription is
  1.    terminated by the stop codon
  2.    terminated by a protein called rho
  3.    terminated by a poly A sequence
  4.    terminated by a start codon
 Discuss Question
Answer: Option B. -> terminated by a protein called rho
Question 58. . 
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
  1.    RNA polymerase I
  2.    RNA polymerase II
  3.    RNA polymerase III
  4.    none of these
 Discuss Question
Answer: Option B. -> RNA polymerase II
Question 59. . Upstream regions which are essential for correct transcription are called
  1.    enhancers
  2.    start codons
  3.    promoters
  4.    transcription factors
 Discuss Question
Answer: Option C. -> promoters
Question 60. . The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed
  1.    start codons.
  2.    oriC regions.
  3.    Shine Dalgarno sequences.
  4.    promoters.
 Discuss Question
Answer: Option D. -> promoters.

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