In regulations demonstrated by initiation of transcription, if lactose is abundant, lactose in this operon system is termed a. inducer b. coactivator C. corepressor d. operator

Explain how the lac operon is regulated under the following conditions. Include the following terms in your answers: Repressor, Operator, RNA polymerase, CAP site, CAP protein, Promoter A. Lactose and glucose are both present. B. Lactose and glucose are both absent. C. Lactose is present and glucose is absent.

You are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan.  Using your knowledge of operons and their regulation   a.Which operons would be functional under these conditions? b.What repressors would be made? (NOTE: name the repressors using their gene names) c.Which repressor(s) would be made in the inactive form? d.Which repressor(s) would be made in the active form? e.Which repressor(s) under these conditions can bind the operator sequence? f.Which repressor(s)under these conditions cannot bind the operator sequence?

In the tryptophan operon, if the leader peptide is translated normally   A region 2 will pair with region 3   B a rho independent terminator will form.   C both a and b   D none of the above

There is a mutation in sequence of the lac operator that prevents the lac repressor from being able to recognize and bind to it. What would the status of transcription of the lac operon be under each of the following circumstances? Explain your answers.   a-Lactose present, glucose present b-Lactose present, glucose absent   c-Lactose absent, glucose present   d-Lactose absent, glucose absent

For a lac operon of genotype l'POʻ*, functional beta-galactosidase is ... (pick the best answer) Select one: O a. Never produced O b. Constitutively produced O c. Under inducible control

Control of the trp operon relies on which of the following: a. High levels of tryptophan causing a pause (but not termination) in transcription b. Low levels of tryptophan causing a pause (but not termination) in transcription c. Allolactose binding to the inhibitor to prevent it from binding to the promoter d. Tryptophan binding to the inhibitor to prevent it from binding to the promoter