Help me answer number 5 to 8 !! 5. What molecule serves as a co-repressor for th

Question

Help me answer number 5 to 8 !!

5. What molecule serves as a co-repressor for the trp operon? a) Ribosome b) Tryptophan c) trpR d) p-galactosidase e) Glucose 6. Which of the following statements about the "glucose effect is true? a) The activity of adenylcyclase is inhibited by glucose. b) Cyclic AMP levels increase when glucose is present. c) CAP activates transcription of the lac operon when glucose is present. d) Cells will metabolize lactose when glucose is present. 7. Attenuation of the trp operon does not include which of the following? a) trpR b) tryptophan d) RNA polymerase c) ribosome e) all are needed 8. The lac operon, when using lacl, is regulated by a(n) a) activator and inducer b) repressor and inducer c) activator and co-repressor d) repressor and co-repressor

Explanation / Answer

5) b- co-repressor is an activating ligand of a repressor protein. Trp repressor is only bind with DNA and repress the transcription when its co-repressor tryptophan is bound with it.

6) a- When glucose levels are high inside the bacteria, which leads to inhibition of adenylyl cyclase and lactose permease, therefore cAMP levels are low and lactose can not be transported inside the bacteria.

7) a- trpR

8) b- The lac operon, when using lacI , is regulated by a repressor and inducer

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