Question

P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? 2. Illustrate it. Include: RNA repressors erase, repressors, and any other molecules needed to show how this worke. GENE TURNED ON -+ + +- Promoter OperatorStructural Genes 3. What happens to transcription at the trp operon when trypto 4. Illustrate it. Include: RNA polymerase, e, repressors and any other molecules needed to show the following GENE TURNED OFF Promoter Operator Structural Genes Circle the correct answer: 5. Most of the time this operon is turned ON OFF. 6. The trp operon is a REPRESSIBLE INDUCIBLE OPERON. 7. When this operon is "turned on" the repressor is ACTIVE INACTIVE. 8. When this operon is "turned off" the repressor is ACTIVE INACTIVE. 9. Draw a picture of the repressor when it is ACTIVE: INACTIVE. ACTIVE 10. When tryptophan is attached to the repressor, the repressor is control. negative 11. The regulation of this operon is an example of positive

Answer 1

1. Transcription will be turned on at trp operon when tryptophan levels are low, because this operon code for enzymes needed for the production of tryptophan ( tryptophan biosynthesis)

2. RNA polymerase will bind to the operator- promoter region to start the trp operon, and the repressor protein will not be bound to the operator region since it is not activated by binding of tryptophan which is the co repressor molecule

3. Transcription will be switched off at trp operon when tryptophan levels are high, because there is no need of operating this system to make tryptophan when tryptophan is already there in the cell

4. RNA polymerase will not be able to bind to the operator- promoter region to start the trp operon, since  the repressor protein ( with tryptophan attached to it ) is bound to the operator region.

1. What happens to transcription at the trp operon when tryptophan levels are low? Why? RNA Polymerase to show how this works 2. Illustrate it. Include: RN A polymerase, repressors, and oy other molecules GENE TURNED ON -i-transcription。 Promoter OperatorStructural Genes Repressor protein [with out tryptophan (co repressor 3. What happens to transcription at the trp operon when tryptophan levels are high. tryptophan 4. Illustrate it. Include: RNA polymerase, repressers and any other molecules needed to show the following transcription off Operator Structural Genes Promoter Operator Repressor molecule with co repressor (tryptophan) attached Circle the correct answer: 5. Most of the time this operon is turned ONOFF 6. The trp operon is a REPRESSIBLE INDUCIBLE OPERON. Since binding of tyrptophan actually represses the transcription, it is a repressible operon 7. When this operon is "turned on the repressor is 8. When 9. n this operon is "turned off the repressor is ACTIVE INACTIVE Draw a picture of the repressor when it is ACTIVE 10. When tryptophan is attached to the repressor, the repressor is LACTIVE INACTIVE 11. The regulation of this operon is an example of positive negative contro