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g.com/ibiscms/mod/ibis vi p c D Welcome, Brendon BI... MsNcom Hotmail o... Suny College at One.. x OL 299 Independent Stu O Student Detail Schedule e Ellucian Degree works -s- Login thread Mod 4 Discussion e Gradebook 3/21/2017 11:00 PM 174lso O3/22/2017 os 56 PM Periodic Table Question 33 of 62 Sapling Learning What is the function of the promoter in the E. colilac operon? is a type of protein that inactivates the expression of the lac operon genes by binding to the DNA of the operon. A promoter is a type of DNA seguence that is located outside the lac operon and expresses the protein that inactivates lactose A promoter is a type of DNA sequence that activates the expression of the lactose genes by acting as an RNA polymerase binding site for the lac operon. is a type of DNA that or inactivates the expression of the lac operon genes by acting as a protein binding site.Explanation / Answer
Answer:
33. (c) A promoter is a type of DNA sequence that activated the expression of the lactose gene by binding as an RNA polymerase binding site for the lac operon.
34. (a) A repressor is a type of protein that inactivates the expression of lac operon genes by binding to the DNA of the lac operon.
35.The sequence of events when lactose is removed from the environment are as follows:
i. Lactose is scarce in the environment.
ii. The repressor is activated in the absence of lactose.
iii. The repressor binds to the operator.
iv. RNA polymerase is prevented from moving from the promoter.
v. Lactose enzyme genes are not transcribed.
vi. The cell no longer digests lactose.
37. (a) Negative regulation
It is an example of repressible negative regulation of gene expression. Within the operon's regulatory sequence, the operator is blocked by the repressor protein in the presence of tryptophan (thereby preventing transcription) and is liberated in tryptophan's absence (thereby allowing transcription).
(Answered the first 4 questions according to rules of Chegg)
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