Lạc Y[ Choose ]operator[ Choose ]Lạc Z[ Choose ]operon[ Choose ]trans-acting[ Choose ]cis-acting[ Choose ]negative regulation[ Choose ]>>>>>>> V[ Choose ]Proteins that are soluble and can move from one DNA strand to another are calledWhen a repressor protein binds to the operator to prevent transcriptionThe gene that encodes B-galactosidaseThe gene that encodes lactose permeaseA segment of DNA found between the promoter and structural genes that acts as a control elementThe transmembrane protein that allows lactose to pass through the cell membrane an into the cellThe gene that encodes for a lac operon repressor proteinRegions of DNA that do not move and control expression locally are calledpositive regulationA set of linked genes under the control of the same promoterThe enzyme that breaks down lactose into galactose and glucose

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Description: Lạc Y[ Choose ]operator[ Choose ]Lạc Z[ Choose ]operon[ Choose ]trans-acting[ Choose ]cis-acting[ Choose ]negative regulation[ Choose ]>>>>>>> V[ Choose ]Proteins that are soluble and can move from one DNA strand to another are calledWhen a represso

Introduction:- Lactose metabolism genes are found in the lac operon of E. coli. It is only expressed…

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Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter16: Gene Expression

Section: Chapter Questions

Problem 7RQ: If glucose is absent, but so is lactose, the lac operon will be. activated repressed activated, but...

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A constitutive mutation in the lac operon may be of several types. [Note that constitutive means that the structural genes are always expressed, even if lactose is absent.] Name two types of constitutive mutations. Group of answer choices LacY- and LacI- LacOc and LacZ- LacZ- and LacI- LacY- and LacA- LacI- and LacOc
Attenuator control of the Trp operon what is the correct option from the choices below? involves a second repressor protein. would also work in eukaryotic cells. requires a short leader peptide gene. is independent of the Trp concentration. regulates transcriptional initiation of the operon.
Resection of a bacterial chromosome in which genes for the enzymes of of a particular metabolic pathway are clusteredtogether in a functional complex under coordinate control is called operon activator promotor repressor operator
94In the arrested state (7-14 nucleotides) of elongation, ( ) is required to reactivate transcription. 95C. elegans has about 19,000 genes, a significant number of which are organized into operons. Yesorno 96Transcription activator proteins have at least two independently folding domains: 1. DNA binding domain and 2.
For each of the following conditions in the Lac Operon, state whether transcription will occur or not and state why. Include all the major actors including glucose, lactose, cAMP and CAP(CPR). Key + (present) - (absent) 1) Glucose-; Lactose- 2) Glucose+; Lactose- 3) Glucose+; Lactose+ 4) Glucose-; Lactose+
Select all of the cis-acting regulatory elements of the lac operon. Operator CAP+cAMP CAP+cAMP binding site LacZ
Lac operon regulation under allolactose functions under____________ control; trp operon regulation under tryptophan functions under____________ control. Group of answer choices negative inducible; negative repressible positive inducible; negative repressible positive inducible; positive repressible negative repressible; negative inducible negative inducible; positive repressible
Fill in the 2 blanks:The lac operon is an example of (blank 1)_______ control in which the presence of an (blank 2)_______ is required for transcription to occur. A) (1) positive / (2) inducer B) (1) positive / (2) activator C) (1) negative / (2) inducer D) (1) negative / (2) activator
A pre-initation complex (PIC) is required for transcription to begin. State which TFII protein has catalytic function.
In your own words describe in detail what happens at the lac operon in each of the following situations Lactose, no glucose (high cAMP) No lactose or glucose (high cAMP) Lactose and glucose (low cAMP) Glucose, no lactose (low cAMP)
76In positive regulation, an enhancer activates a promoter. Yesorno 77Mutant tRNA molecules can ________ mutations that create termination codons within a reading frame. A.transposeb.suppressc.activateD.translocate 78 ( ) permits a cell to recode genetic information in a systematic and regulated fashion.
The a/a operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n). activator inducer repressor operator