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MCQs

Total Questions : 47 | Page 2 of 5 pages
Question 11. Sex determination in Drosophila involves
  1.    gene amplification
  2.    none of these
  3.    alternate splicing
  4.    methylation
 Discuss Question
Answer: Option C. -> alternate splicing
Question 12. Enhancers differ from promoters in that
  1.    they initiate transcription
  2.    they are restricted to a specific gene
  3.    their orientation can be inverted without effect
  4.    they are adjacent to the start codon
 Discuss Question
Answer: Option C. -> their orientation can be inverted without effect
Question 13. Which of the following occur in the presence of glucose?
  1.    None of these
  2.    cAMP increases
  3.    lac Z gene expression is increased
  4.    Binding of CAP-cAMP complex to the promoter area decreases
 Discuss Question
Answer: Option D. -> Binding of CAP-cAMP complex to the promoter area decreases
Question 14. Which of the following is not a transcription factor?
  1.    Helix-turn-helix proteins
  2.    Leucine zipper proteins
  3.    Zinc finger proteins
  4.    Steroid hormones
 Discuss Question
Answer: Option D. -> Steroid hormones
Question 15. Methylated gene are
  1.    either (a) or (b)
  2.    silent
  3.    active
  4.    dynamic
 Discuss Question
Answer: Option B. -> silent
Question 16. Sex hormones activate transcription of specific genes by
  1.    binding to DNA promoter region
  2.    binding to DNA enhancer region
  3.    binding to a transcription factor
  4.    binding to RNA polymerase
 Discuss Question
Answer: Option C. -> binding to a transcription factor
Question 17. In the presence of tryptophan in the cell, the repressor is __________
  1.    bound to DNA
  2.    bound to tryptophan
  3.    bound to neither tryptophan nor DNA
  4.    bound to both DNA and tryptophan
 Discuss Question
Answer: Option D. -> bound to both DNA and tryptophan
Question 18. The lac operon is translated into __________ proteins.
  1.    2
  2.    4
  3.    1
  4.    3
 Discuss Question
Answer: Option D. -> 3
Question 19. DNA is methylated at
  1.    AC sequences
  2.    TATA sequences
  3.    CG sequences
  4.    CAAT sequences
 Discuss Question
Answer: Option C. -> CG sequences
Question 20. Catabolite activating protein exerts __________ control on transcription of the lac operon genes.
  1.    may be positive or negative
  2.    positive
  3.    none of these
  4.    negative
 Discuss Question
Answer: Option B. -> positive

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