Answers.Lac

Applications & Technologies
Lac Operon Answers

    Lac Operon Review Answers:

     1. D - The inducer is not a portion of the chromosome itself. Lactose, for instance, is a disaccharide that will be found in the prokaryote's environment.

     2. D - Jacob and Manod conducted the experiment which showed the presence of the lac operon in bacteria.

     3. B - Lactose is the inducer. It alone can cause the production of B-galactosidase which will catabolize this disaccharide.

     4. C - RNA Polymerase attaches to the Promoter. This is where transcription of mRNA will begin.

     5. A - The repressor protein binds to the operator, thus blocking RNA Polymerase from attaching to the promoter.

     6. D - The regulator produces the repressor protein.

     7. A - The inducer, which in this case is lactose, binds to the repressor protein causing it to fall off of the operator, thus allowing RNA polymerase to bind and start transcription.

     8. G - Structural genes are the portion of the lac operon responsible for coding the proteins that will be produced. One protein produced is the enzyme responsible for lactose catabolism - B-galactosidase.

     9. E - The operator is located adjacent to the promoter, explaining why the repressor protein physically blocks RNA Polymerase from binding at the promoter.

     10. D - The regulator can be found anywhere on the bacterial chromosome. It codes for the production of repressor protein, which is able to move about the operon in order to attach to the operator.

If you have a question on anything you encountered in the above questions or Operon Information in general, please Ask me.