1. The lactose operon is controlled by both lactose and glucose. Fill in the following table toindicate what would be occurring under different cellular conditionsLactoseabsentpresentabsentpresentGlucose OperonActivity(high/low)absentabsentpresentpresentlowhigh10WhighCAMPRepressor(bound/free) (high/low)boundfreebuindwillhighhighlowCAP(bound/free)boundfreefull

The lactose operon is a catabolic operon in Ecoli that encodes proteins that are necessary for the…

Answered: 1. The lactose operon is controlled by…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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The operator of the lactose operon in E. Coli is located: between the promoter and the repressor gene upstream of the promoter between the promoter and the structural genes anywhere on the chromosome among the structural genes
The lac operon produces: (choose the best answer) OA single mRNA molecule O A single protein OA single mRNA molecule and a single protein O Multiple proteins OA single mRNA molecule and multiple proteins
Operator | Choose [Choose) A set of genes transcribed together under the regulatory control of a singe promoter A regulatory protein that binds to an region of non-coding DNAgene that suppresses transcriptionby blocking RNA polmer A segment of DNA where the repressor binds to, therety preventing the transcription of certain genes An operon that isalways "off" - turned on by environmental cues an operon that isalways "on"- turned off by environmental cues TChoose Operon Repressor Repressible Operon [ Choose nducible operon [Choose |
In the absence of lactose and the presence of glucose the lac operon is strongly expressed Lacl is not bound bound to the CAP binding site. to the operator and CAP is
This figure represents the ABC operon, which is a negative inducible operon, and its associated regulatory gene. The structural genes produced by the operon convert molecule A into molecule D. When molecule A is present in the environment, it will bind to the regulatory protein, and operon expression will be induced. operator testR testR promoter regulatory protein testP testo structural genes test1 test1 test2 test2 test3 test3 structural proteins
CAP-binding site Gene for Operator Gene for repressor protein Promoter for I gene Promoter for permease lac operon Gene for Gene for B-galactosidase transacetylase lac P, A Regulatory region Coding region For the above picture, draw all the proteins and molecules AND WHERE THEY BIND under conditions of no lactose, no glucose.
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
28. 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.
When lactose is present lactose induces the activation of the genes in the lac operon by binding the repressor lactose represses the activation of the genes in the lac operon by binding the repressor lactose induces the activation of the genes in the lac operon by binding the operator lactose represses the activation of the genes in the lac operon by binding the operator
In the tryptophan operon, tryptophan is considered a Group of answer choices coactivator inducer an enhancer corepressor an attenuator
An E. coli cell as the following genotype for the lac operon system: I- OC Z+ / F’ I+. Which term best describes the regulation of expression of the beta galactosidase in this cell? Group of answer choices Inducible None of these Activated Always repressed Constitutive
Match each description with the appropriate label (allo)Lactose binds to the lac repressor, causing it to release from the promoter CAP binds CAMP to stimulate transcripti of the lac operon ✓ [Choose ] positive control of an inducible gene negative control of an inducible gene [Choose]

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