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MCQs

Total Questions : 47 | Page 5 of 5 pages
Question 41. . In the presence of tryptophan in the cell, the repressor is __________
  1.    bound to tryptophan
  2.    bound to DNA
  3.    bound to both DNA and tryptophan
  4.    bound to neither tryptophan nor DNA
 Discuss Question
Answer: Option C. -> bound to both DNA and tryptophan
Question 42. . DNA is methylated at
  1.    AC sequences
  2.    TATA sequences
  3.    CAAT sequences
  4.    CG sequences
 Discuss Question
Answer: Option D. -> CG sequences
Question 43. . Catabolite activating protein exerts __________ control on transcription of the lac operon genes.
  1.    positive
  2.    negative
  3.    may be positive or negative
  4.    none of these
 Discuss Question
Answer: Option A. -> positive
Question 44. . Why are several structural genes regulated as a unit in bacteria?
  1.    An accident of evolution
  2.    It allows coordinating regulation of genes with a common function
  3.    The bacteria chromosome is so small; many different genes must be controlled by the same promoter
  4.    none of the above
 Discuss Question
Answer: Option B. -> It allows coordinating regulation of genes with a common function
Question 45. . Alternate splicing of RNA transcripts is a mechanism to regulate
  1.    tubulin
  2.    tachykinins
  3.    DNA methylation
  4.    leucine zippers
 Discuss Question
Answer: Option B. -> tachykinins
Question 46. . Why are several structural genes regulated as a unit in bacteria?
  1.    An accident of evolution
  2.    It allows coordinating regulation of genes with a common function
  3.    The bacteria chromosome is so small; many different genes must be controlled by the same promoter
  4.    none of the above
 Discuss Question
Answer: Option B. -> It allows coordinating regulation of genes with a common function
Question 47. . Alternate splicing of RNA transcripts is a mechanism to regulate
  1.    tubulin
  2.    tachykinins
  3.    DNA methylation
  4.    leucine zippers
 Discuss Question
Answer: Option B. -> tachykinins

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