Homework Answers
A. -
In this E. coli strain, LacZ is mutated (LacZ-), therefore, there is no Beta-Galactosidase activity.
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Consider the following lac operon genotype: laci+P+OCZY+A+ In an E. coli strain with this genotype, what...
Consider the following partial diploid genotype of an Escherichia coli strain regarding the lac operon: lact...
Consider the following partial diploid genotype of an Escherichia coli strain regarding the lac operon: lact P+O+Z+Y+ A+/lacp+O+Z+Y+ A+ In the PRESENCE of lactose, what is the state of beta- galactosidase expression? O A.- OB. + OC. Can't tell
Three different strains of E. coli carry a mutation in the lac operon and/or laci gene....
Three different strains of E. coli carry a mutation in the lac operon and/or laci gene. The production of B-galactosidase (+ present or - absent) is measured when lactose is present and absent from the medium. Assume the mutations involve only 1, 0, or Z. A merodiploid is constructed for each of the three strains. The plasmid carries a wild type lac operon and lacl gene. The production of functional B-galactosidase (+ present or - absent) is measured when lactose...
You plate colonies of E. coli with the lac operon genotype of I+P+OCZ+CAP+ on 1) a...
You plate colonies of E. coli with the lac operon genotype of I+P+OCZ+CAP+ on 1) a medium containing only glucose, and 2) a medium containing only lactose. You isolate mRNA from bacteria from each medium and do a Northern blot with a probe for β-galactosidase. Draw the results.
The lac operon in E. coli is a well-studied gene system, and β-galactosidase (β-gal) is the...
The lac operon in E. coli is a well-studied gene system, and
β-galactosidase (β-gal) is the product of the lacZ gene. The
diploid conditions represent the addition of a plasmid carrying
different components of the lac operon. Determine if β-gal will be
generated under the conditions. Assume that glucose is absent. A +
in the genotype indicates a functioning gene, while a – indicates a
loss-of-function allele. The OC is an operator mutant that cannot
bind the lacI protein. Use...
A mutant E. coli strain is found that synthesizes B-galactosidase and permease but no B-galactoside-transacetylase in...
A mutant E. coli strain is found that synthesizes B-galactosidase and permease but no B-galactoside-transacetylase in the presence of lactose (or allolactose). What mutation(s) can lead to this outcome? The lac operon is shown here as a guide. zones where proteins bind DNA: genes and regulatory sequences I lacl promoter operator lac Z l ac Y La repressor B-galactosidase B-galactoside transacetylase proteins Operator Laci promoter Lac Y Lac A Lacz
help please as soon as possible A mutant E. coli strain is found that does not...
help please as soon as possible
A mutant E. coli strain is found that does not synthesize any enzymes in the presence or absence of lactose (or allolactose). W mutation(s) can lead to this outcome? The lac operon is shown here as a guide. fones where proteins bind DNA genes and regulatory sequences Operator La repressor B-galactosidase B-galactos de transactylase proteins promoter Operator Lacy Lac A laci o Lacz
The lac operon contains a DNA sequence known as the lac promoter (P or P+ for...
The lac operon contains a DNA sequence known as the lac promoter (P or P+ for wild type; P– for mutant (RNA polymerase does not bind)) that serves as the RNA polymerase binding site. The lac operon also contains a DNA sequence known as the Lac operator (O or O+ for wild type; O– or Oc for mutant (lac repressor cannot bind)) which is the binding site for lac repressor. The lac repressor, a protein, is encoded by the lac...
Most of what we know about the lac operon in E. coli has come from the...
Most of what we know about the lac operon in E. coli has come from the genetic analysis of various mutants. Below is a list of mutants for regions of the operon. A + superscript indicates no mutation and normal function of that region, - indicates a knock out and no function of that region, c indicates the mutation resulted in constitutive action of that region. The effect of the mutation is determined by expression of the lacZ gene as...
You have systematically mutagenized the lac operon in E. coli to produce a mutation that disrupts...
You have systematically mutagenized the lac operon in E. coli to produce a mutation that disrupts the function of each of the following elements: a. the promoter for LacI (P(I)) b. the LacI gene c. CRP binding site d. the promoter for the lac operon (P(lac)) e. the operator sequence f. a mutation in lacZ that disrupts the coding region but does not disrupt transcription g. a mutation in lacZ that blocks transcription For each of the above mutations, what...
In a lacI- strain of E. coli (the repressor protein is not expressed in this mutant)...
In a lacI- strain of E. coli (the repressor protein is not expressed in this mutant) the lac operon will be expressed...
Consider the following partial diploid genotype of an Escherichia coli strain regarding the lac operon: lact P+O+Z+Y+ A+/lacp+O+Z+Y+ A+ In the PRESENCE of lactose, what is the state of beta- galactosidase expression? O A.- OB. + OC. Can't tell
Three different strains of E. coli carry a mutation in the lac operon and/or laci gene. The production of B-galactosidase (+ present or - absent) is measured when lactose is present and absent from the medium. Assume the mutations involve only 1, 0, or Z. A merodiploid is constructed for each of the three strains. The plasmid carries a wild type lac operon and lacl gene. The production of functional B-galactosidase (+ present or - absent) is measured when lactose...
The lac operon in E. coli is a well-studied gene system, and
β-galactosidase (β-gal) is the product of the lacZ gene. The
diploid conditions represent the addition of a plasmid carrying
different components of the lac operon. Determine if β-gal will be
generated under the conditions. Assume that glucose is absent. A +
in the genotype indicates a functioning gene, while a – indicates a
loss-of-function allele. The OC is an operator mutant that cannot
bind the lacI protein. Use...
A mutant E. coli strain is found that synthesizes B-galactosidase and permease but no B-galactoside-transacetylase in the presence of lactose (or allolactose). What mutation(s) can lead to this outcome? The lac operon is shown here as a guide. zones where proteins bind DNA: genes and regulatory sequences I lacl promoter operator lac Z l ac Y La repressor B-galactosidase B-galactoside transacetylase proteins Operator Laci promoter Lac Y Lac A Lacz
help please as soon as possible
A mutant E. coli strain is found that does not synthesize any enzymes in the presence or absence of lactose (or allolactose). W mutation(s) can lead to this outcome? The lac operon is shown here as a guide. fones where proteins bind DNA genes and regulatory sequences Operator La repressor B-galactosidase B-galactos de transactylase proteins promoter Operator Lacy Lac A laci o Lacz
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