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MCQs

Total Questions : 37 | Page 4 of 4 pages
Question 31. . A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called
  1.    activation
  2.    attenuation
  3.    corepression
  4.    desiccation
 Discuss Question
Answer: Option B. -> attenuation
Question 32. .  Which of the following proteins first binds to TATA box during transcription?
  1.    TF II A
  2.    TF II D
  3.    TF II B
  4.    RNA polymerase
 Discuss Question
Answer: Option B. -> TF II D
Question 33. . The components found in all prokaryotic transcription terminators is
  1.    a poly-U region
  2.    Rho factor
  3.    a hairpin structure
  4.    none of these
 Discuss Question
Answer: Option C. -> a hairpin structure
Question 34. . A specific __________ factor helps RNA polymerase bind to late promoters and transcribe late genes.
  1.    sigma
  2.    beta
  3.    delta
  4.    gamma
 Discuss Question
Answer: Option A. -> sigma
Question 35. .  Which of the following proteins first binds to TATA box during transcription?
  1.    TF II A
  2.    TF II D
  3.    TF II B
  4.    RNA polymerase
 Discuss Question
Answer: Option B. -> TF II D
Question 36. . A specific __________ factor helps RNA polymerase bind to late promoters and transcribe late genes.
  1.    sigma
  2.    beta
  3.    delta
  4.    gamma
 Discuss Question
Answer: Option A. -> sigma
Question 37. . The components found in all prokaryotic transcription terminators is
  1.    a poly-U region
  2.    Rho factor
  3.    a hairpin structure
  4.    none of these
 Discuss Question
Answer: Option C. -> a hairpin structure

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