1. (a) Lactose levels are high Lac Operon Genes are switched OFF Lac Operon Genes are switched ON Does NOT affect the gene expression (b) Enhancer and activator proteins are working together Gene is switched ON Gene is switched OFF Does NOT affect the gene expression

1. (a) Lactose levels are high Lac Operon Genes are switched OFF Lac Operon Genes are switched ON Does NOT affect the gene expression (b) Enhancer and activator proteins are working together Gene is switched ON Gene is switched OFF Does NOT affect the gene expression

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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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 full
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 |
Please compare the effect of an active enhancer at the level of RNA transcription with the effect of an active enhancer at the level of RNA splicing
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
In the lac operon, the lacZ gene codes for an enzyme called ____________, which catalyze the breakdown of the sugar __________ into monosaccharides. This enzyme can also hydrolyze the sugar analog ____________, which produces blue pigments following its breakdown. Since the lac operon is not always on the bacterial cells, we add the chemical ________ which prevents the lac depressor from binding to the operators, leading to constitutive expression of the operon.
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.
BONUS One benefit of operons in bacteria is that they AYO allow for the bacteria to utilize a wide variety of carbon sources. B) O allow for coordinated gene expression of related genes on one mRNA controlled by one promoter. C) O do not need ligands and regulatory proteins as single genes would. D) O do not need any modification of the proteins after they are expressed.
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
Response elements are similar to operons in that they are controlled by a single promoter are enhancers of transcription activated by metabolic factors are not affected by steroids are silencers of transcription triggered by the presence of metal ions
In the tryptophan operon, tryptophan is considered a Group of answer choices coactivator inducer an enhancer corepressor an attenuator
Which of the following statements concerning enhancer DNA sequences is true? Group of answer choices Enhancer DNA sequences must be located before (upstream) the genes they control. Enhancers DNA sequences are close to the genes they activate (via looping) even if they very far away as measured through the linear DNA sequence. Enhancer DNA sequences will not recruit their respective protein factors if you artificially insert the enhancer backwards. All these statements are true.