How might a frame shift mutation in the lacy region influence the phenotype of this bacteria when glucose is abundant in the cell? • How would a missense mutation in lacl alter the amount of B-Galactosidase present in the cell? ● If wild type E. coli were exposed to a growth medium containing glucose, lactose and cyclic adenosine monophosphate, what would happen to the lac operon? Repressor gene lacl Regulatory region Promoter-Operator B-Galactosidase gene P O lacz Structural genes Permease gene lac Operon lacy Transacetylase gene lacA

How might a frame shift mutation in the lacy region influence the phenotype of this bacteria when glucose is abundant in the cell? • How would a missense mutation in lacl alter the amount of B-Galactosidase present in the cell? ● If wild type E. coli were exposed to a growth medium containing glucose, lactose and cyclic adenosine monophosphate, what would happen to the lac operon? Repressor gene lacl Regulatory region Promoter-Operator B-Galactosidase gene P O lacz Structural genes Permease gene lac Operon lacy Transacetylase gene lacA

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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B Ix Paragraph Styles Dictate Sensitivit As a graduate student, Prof. Rolfes studied the E. coli regulatory protein PurR. 6. PurR regulates several small operons and single genes whose encoded proteins are involved in the biosynthesis of the purine nucleotides A and G. PurR binds to an operator (0) in the RURGMN operon to regulate its transcription. purG is a structural gene that encodes an enzyme, glutamine PRPP amidotransferase (GPAT), and its enzyme activity can be measured. The expression of purG is repressed when cells are grown in media with guanine, and that repression requires PurR (see first two lines in the table below). Predict the GPAT activity in the following strains. R refers to pwrR: O to purQ; G to purG; the + means functional and the- means non-functional. a. GPAT activity Strain Genotype R+ Q+ G+ Growth with guanine Low activity High activity Growth without guanine High activity High activity R-O+ G+ R+ O+G R+ 0-G+ R-0+ G+/F R+ R+ 0-G+/F' O+ G+ No activity No…
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Q1. Bioluminescence is emitted by the marine bacterium Vibrio fischeri in response to the concentration of a chemical signal. The luxCDABEG genes form part of an operon that encodes all of the structural components necessary for light production. At high cell density, the concentration of the inducer increases and can bind to LuxR protein which then activates transcription of the operon. What kind of operon is the Lux operon? [Positive Inducible, Positive Repressible, Negative Inducible, Negative Repressible?] Q2. A population of bacteria has a Lux operon that produces bioluminesence via an autoinducer that activates a transcription factor. You grow a flask of cells that have a loss-of-function mutation in the gene that encodes the enzyme that produces an autoinducer. What is the predicted bioluminesence in this population at high and low density?
Select all the examples of mutations that are likely to have a global effect on gene expressio
Metabolic control is crucial part of survival for all bacteria. The lactose operon is located on the bacteria chromosome and assists in maintaining homeostasis. (l) Describe how an operon regulates the expression of genes. (m) Feedback plays an important part in life helping to maintain homeostasis. Explain how both negative and positive feedback help maintain homeostasis
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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 |
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