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MCQs

Total Questions : 282 | Page 11 of 29 pages
Question 101. 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
Answer: (a).recognition of the -10 sequence and -35 sequence
Question 102. 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
Answer: (b).upstream from the start codon
Question 103. Transcription results in
  1.    an amino acid chain
  2.    messenger RNA
  3.    complementary DNA
  4.    Okazaki fragments
 Discuss Question
Answer: Option B. -> messenger RNA
Answer: (b).messenger RNA
Question 104. 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
Answer: (a).in equilibrium with free RNA polymerase and the promoter
Question 105. 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
Answer: (a).at least two distinct domains of protein structure, a DNA binding domain and an activation domain
Question 106. 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
Answer: (b).terminated by a protein called rho
Question 107. 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
Answer: (b).RNA polymerase II
Question 108. 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
Answer: (d).all of these
Question 109. 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
Answer: (c).promoters
Question 110. Transcription of each set of rRNA genes by RNA polymerasel produces
  1.    a single 45S rRNA precursor molecule
  2.    a single 5S rRNA precursor molecule
  3.    a single 18S rRNA precursor molecule
  4.    a single 28S rRNA precursor molecule
 Discuss Question
Answer: Option A. -> a single 45S rRNA precursor molecule
Answer: (a).a single 45S rRNA precursor molecule

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