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MCQs

Total Questions : 65 | Page 5 of 7 pages
Question 41.  Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes
  1.    are transcribed by rRNA polymerase III and the 5S rRNA
  2.    are transcribed by rRNA polymerase II
  3.    are transcribed by rRNA polymerase I and the 5S rRNA
  4.    are transcribed by DNA polymerase I
 Discuss Question
Answer: Option A. -> are transcribed by rRNA polymerase III and the 5S rRNA
Question 42. . The function of the sigma factor of RNA polymerase is to
  1.    assure that transcription begins at the proper point
  2.    assure that transcription ends at the proper point
  3.    assure that translation begins at the proper point
  4.    assure that translation ends at the proper point
 Discuss Question
Answer: Option A. -> assure that transcription begins at the proper point
Question 43. . Each tRNA molecule has a cloverleaf secondary structure consisting of
  1.    three stem loops
  2.    two stem loops
  3.    four stem loops
  4.    either (a) or (b)
 Discuss Question
Answer: Option A. -> three stem loops
Question 44. . What is a promoter?
  1.    A specific sequence of DNA to which a catabolic repressor binds
  2.    A specific sequence of DNA to which RNA polymerase binds
  3.    A specific DNA sequence to which a restriction endonuclease binds
  4.    None of the above
 Discuss Question
Answer: Option B. -> A specific sequence of DNA to which RNA polymerase binds
Question 45. . The RNA polymerases that transcribe bacterial DNA are
  1.    multisubunit enzymes
  2.    only active inside the cell
  3.    interchangable with DNA polymerases
  4.    highly glycosylated in their active forms
 Discuss Question
Answer: Option A. -> multisubunit enzymes
Question 46. .  Immediately after transcription
  1.    a methylated guanine cap is added to the 51 end of the transcript
  2.    a methylated guanine cap is added to the 31 end of the transcript
  3.    both (a) and (b)
  4.    a poly adenylation signal is added
 Discuss Question
Answer: Option A. -> a methylated guanine cap is added to the 51 end of the transcript
Question 47. . Transcription factors are
  1.    promoters
  2.    proteins which bind to DNA and regulate transcription
  3.    TATA boxes
  4.    CATT boxes
 Discuss Question
Answer: Option B. -> proteins which bind to DNA and regulate transcription
Question 48. . Most transcripts of protein coding genes are cleaved
  1.    at the 3' end just after a poly adenylation signal
  2.    at the 3' end just before a poly adenylation signal
  3.    at the 5' end immediately after a poly adenylation signal
  4.    at the 5' end immediately before a poly adenylation signal
 Discuss Question
Answer: Option A. -> at the 3' end just after a poly adenylation signal
Question 49. . The major function of RNA polymerase's sigma factor is
  1.    recognition of the translational stop sequence
  2.    recognition of the transcriptional start sequence
  3.    recognition of the transcriptional stop sequence
  4.    recognition of the translational start sequence
 Discuss Question
Answer: Option B. -> recognition of the transcriptional start sequence
Question 50. . RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________
  1.    translation, RNA polymerase
  2.    transcription, DNA polymerase
  3.    transcription, RNA polymerase
  4.    replication, DNA polymerase
 Discuss Question
Answer: Option C. -> transcription, RNA polymerase

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