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OPERON MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. Once transcription has been completed, which of the following is NOT necessary for protein synthesis to occur?
  1.    tRNA
  2.    ribosomes
  3.    mRNA
  4.    DNA
 Discuss Question
Answer: Option D. -> DNA
Question 12. What are the structural genes of lac operon?
  1.    lac A
  2.    lac Z
  3.    lac Y
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Question 13. What is the inducer for lac operon?
  1.    allolactose
  2.    bllolactose
  3.    cllolactose
  4.    dllolactose
 Discuss Question
Answer: Option A. -> allolactose
Question 14. For a repressible operon to be transcribed, which of the following must be true?
  1.    A corepressor must be present.
  2.    RNA polymerase and the active repressor must be present.
  3.    RNA polymerase must bind to the promoter, and the repressor must be inactive and not blocking the promoter region.
  4.    RNA polymerase cannot be present, and the repressor must be inactive.
 Discuss Question
Answer: Option C. -> RNA polymerase must bind to the promoter, and the repressor must be inactive and not blocking the promoter region.
Question 15. All these condition causes ara operon to turn on EXCEPT
  1.    arabinose is bind to araC activator protein
  2.    arabinose is present
  3.    cAP-cAMP is present
  4.    loop is formed
 Discuss Question
Answer: Option D. -> loop is formed
Question 16. The repressor is the protein product of a(n)
  1.    operator
  2.    regulatory gene
  3.    lac gene
  4.    corepressor
 Discuss Question
Answer: Option B. -> regulatory gene
Question 17. What is the role of the ribosome in protein synthesis?
  1.    it is where mRNA synthesis occurs
  2.    it is where DNA synthesis occurs
  3.    it is where protein synthesis occurs
  4.    it is where gene synthesis occurs
 Discuss Question
Answer: Option C. -> it is where protein synthesis occurs
Question 18. Structural genes of trp operon encodes for
  1.    tryptophan synthetase
  2.    tryptophan dioxygenase
  3.    tryptophan kinase
  4.    tryptophan polymerase
 Discuss Question
Answer: Option A. -> tryptophan synthetase
Question 19. An operon consists of all of the following except:
  1.    operator
  2.    regulatory gene
  3.    promoter
  4.    genes of the operon
 Discuss Question
Answer: Option B. -> regulatory gene
Question 20. What is the role of operons in prokaryote gene expression?
  1.    It makes the genes prokaryotes be turned on
  2.    It accounts for the regulation of gene activity in response to the needs of the cells
  3.    To make DNA for the gene
  4.    To make the gene turn of and off
 Discuss Question
Answer: Option B. -> It accounts for the regulation of gene activity in response to the needs of the cells

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