Quiz  /  Operon Gate & PSU MCQ Questions With Answers

  • 1. 
    Trp operon is an example of operon that operates ___________

  • ababolically
  • catabolically

  • 2. 
    What is 4 in the diagram?

  • RNA polymerase
  • Inducer
  • Repressor
  • Operator

  • 3. 
    The tryptophan operon is

  • permanently turned on.
  • turned on when tryptophan is present in the growth medium.
  • turned off only when glucose is present in the growth medium.
  • turned off when tryptophan is added to the growth medium.

  • 4. 
    In the lac operon the inducer is

  • allolactose
  • glucose
  • galactose
  • all of the above

  • 5. 
    What is 1 in the diagram?

  • RNA polymerase
  • Inducer
  • Repressor
  • Operator

  • 6. 
    What is 5 in the diagram?

  • RNA polymerase
  • Inducer
  • Repressor
  • Operator

  • 7. 
    Ara operon will be turned off once the araC binds to the operator of the _________ and binds to___________

  • araO2 , araI
  • araC , araB
  • araO1, araO2
  • araA, araD

  • 8. 
    What is 2 in the diagram?

  • RNA polymerase
  • Inducer
  • Repressor
  • Operator

  • 9. 
    In the bottom picture the operon is

  • on
  • off

  • 10. 
    What does a promoter do?

  • it allows a gene to be transcribed
  • it creates a DNA segment
  • it is another word for ribosomes
  • it is another word for RNA

  • 11. 
    All these condition causes ara operon to turn on EXCEPT

  • arabinose is bind to araC activator protein
  • arabinose is present
  • cAP-cAMP is present
  • loop is formed

  • 12. 
    In attenuation, the operon will stop once sequence _________and _________ basepair

  • 1,2
  • 2,3
  • 3,4
  • 1,3

  • 13. 
    Structural genes of trp operon encodes for

  • tryptophan synthetase
  • tryptophan dioxygenase
  • tryptophan kinase
  • tryptophan polymerase

  • 14. 
    Structural genes of ara operon are

  • ara D,A,B
  • ara B,A,D
  • ara Z,Y,A
  • ara E,D,C,B,A
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