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MCQs

Total Questions : 65 | Page 3 of 7 pages
Question 21. Transcription begins
  1.    at the start codon
  2.    none of these
  3.    downstream from the start codon
  4.    upstream from the start codon
 Discuss Question
Answer: Option D. -> upstream from the start codon
Question 22. The transcriptional regulatory proteins in eukaryotes which induce transcription usually have
  1.    none of these
  2.    at least one distinct domains of protein structure, a DNA binding domain and an activation domain
  3.    at least two distinct domains of protein structure and a DNA binding domain
  4.    at least two distinct domains of protein structure, a DNA binding domain and an activation domain
 Discuss Question
Answer: Option D. -> at least two distinct domains of protein structure, a DNA binding domain and an activation domain
Question 23. Transcription results in
  1.    messenger RNA
  2.    an amino acid chain
  3.    complementary DNA
  4.    Okazaki fragments
 Discuss Question
Answer: Option A. -> messenger RNA
Question 24. RNA polymerase holoenzyme initiates transcription which involves
  1.    recognition of the -10 sequence only
  2.    None of these
  3.    recognition of the -10 sequence and -35 sequence
  4.    recognition of the -35 sequence only
 Discuss Question
Answer: Option C. -> recognition of the -10 sequence and -35 sequence
Question 25. In prokaryotes, transcription is
  1.    terminated by a poly A sequence
  2.    terminated by the stop codon
  3.    terminated by a protein called rho
  4.    terminated by a start codon
 Discuss Question
Answer: Option C. -> terminated by a protein called rho
Question 26. In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
  1.    RNA polymerase III
  2.    none of these
  3.    RNA polymerase I
  4.    RNA polymerase II
 Discuss Question
Answer: Option D. -> RNA polymerase II
Question 27. Transcription of each set of rRNA genes by RNA polymerasel produces
  1.    a single 18S rRNA precursor molecule
  2.    a single 28S rRNA precursor molecule
  3.    a single 5S rRNA precursor molecule
  4.    a single 45S rRNA precursor molecule
 Discuss Question
Answer: Option D. -> a single 45S rRNA precursor molecule
Question 28. The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed
  1.    promoters.
  2.    start codons.
  3.    oriC regions.
  4.    Shine Dalgarno sequences.
 Discuss Question
Answer: Option A. -> promoters.
Question 29. Upstream regions which are essential for correct transcription are called
  1.    enhancers
  2.    transcription factors
  3.    start codons
  4.    promoters
 Discuss Question
Answer: Option D. -> promoters
Question 30. The nucleons of eukaryotic cell has
  1.    RNA polymerase I
  2.    all of these
  3.    RNA polymerase II
  4.    RNA polymerase III
 Discuss Question
Answer: Option B. -> all of these

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