Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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- 1. The lactose operon is controlled by both lactose and glucose. Fill in the following table to indicate what would be occurring under different cellular conditions Lactose absent present absent present Glucose Operon Activity (high/low) absent absent present present low high 10W high CAMP Repressor (bound/free) (high/low) bound free buind will high high low CAP (bound/free) bound free fullarrow_forwardOperons A. Draw a schematic of the lac operon when glucose is low and lactose is high in the cell’s environment. B. Draw a schematic of the trp operon when tryptophan levels in the environment are low. C. What is the lux operon and how is affected by quorum sensing?arrow_forwardExplain 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.arrow_forward
- 3 5. Suppose you performed a B-galactosidase assay on E. coli with a l*P+O°Z*Y operon. What results would you expect in the absence and presence of IPTG? 6. If you did not get the expected results for the previous question, but you knew the genotype of the operon was correct, name two ways your experiment could have gone wrong.arrow_forward28. Which statement does NOT explain why the lac operon would not be effectively regulated by an attenuation mechanism like the trp operon? 1.Lactose is a substrate for the lac operon protein products. 2.Products of lac operon enzymes are not used in protein synthesis. 3.Transcription and translation do not happen simultaneously for the lac operon. 4.Attenuation is a suitable regulatory mechanism for anabolic amino acid pathways. 5.All of these statements explain why regulation by attenuation would not be effective for the lac operon.arrow_forwardIn the ara operon in E. coli cells, AraC will bind to its specific target DNA when_ O a. when there is no glucose in cells. O b. it does not bind arabinose O c. it binds arabinose O d. it binds allolactose.arrow_forward
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