Question

gene regulation of bacteria operon systems. Protected View . Saved to this PG References Mailings Review View Help Tell me what you want to do ernet can contain viruses. Unless you need to edit, it's safe to stay in Protected View Enable Editing 5. What happens if lactose levels are low? Put the following list in order (1-5). RNA polymerase is blocked from transcribing the genes for the lactose metabolizing enzymes When RNA polymerase binds to the promoter, it cannot get past the Lacl repressor protein The entrymes B-galactosidae, Balacosidae permease, and transacetylase are not required by the cell due to low levels of lactose Lactose does not bind to the repressor protein, Lad Lad, a repressor protein, is bound to the operator, which follows the promoter What happens if tryptophan levels are high? Put the following list in order (1-4). The trp repressor-tryptophan complex can now bind to the operator of the trp operon Tryptophan does not need to be produced by the trp operon Tryptophan will bind to the repressor protein, changing its conformation RNA polymerase is blocked from transcribing the genes needed to synthesize tryptophan What happens if lactose is present and glucose is scarce? Put the following list in order (1-7). Start with the effects if Lactose levels then proceed to the effects of glucose levels. Now that Lac has been removed for the operator, RNA polymerase can proceed with transcription CAMP binds to CAP regulatory protein, causing it to bind to the promoter of the lac operon The enzymes needed for lactose metabolism must be transcribed when lactose is present

Answer 1

5. A. Lactose

ANSWER - 3,4,5,2,1

The enzyme B-galactose, B-galactosidae permease, and transacebylase are not required by the cell due to low levels of lactose Laclose doesnot bind to the repossos proteen, had had, a repressor protein, is bound to the operator, which follows the promotes When RNA paymerase binds to the poomder it cannot get past the had repressor poolein RNA polymoase & blacked from transcribing the genes for the lactose metabolizing enzymes Dolumesase

B. Tryptophan

ANSWER - 2,3,1,4

Tryptophan does not need to be produced by the top opeson Təyptophan will bind to the repressos poteon , changing ik conformation The top repressor-tryptophan complex can now bind to the operator of the top opeson ! RNA polymerase is blocked from transcribing the genes needed to synthesize byptophan.

when lactose bilpresent , loc wepressao binds to operator, prevents the transcription by RNA polymerase. The repoesor proteen is active when lactose is binded to it. When repousson binds to gerados, RNA polymerase can't read the Sequence and transcription will stop. When typtophan is present, tryptophan is not needed to Pooduced. So, doyplophan binds to gepsessoy and change des combomation. The top-repoesoo complex binds to operator and stops toanscription: