There are two different strains of E. coli. One type is a wild type and the other is a lac operon mutant. The lac operon wild type has the genotype: I+P+O+Z+Y+A+ What is a silent mutation? What w...
Homework Answers
silent mutation is a mutation where a change in the DNA codon does not result in a change in amino acid translation. and for lac operon genes if mutated will result in lac- genotype .i.e cells which cannot utilize beta galactosidase as nutrient.
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There are two different strains of E. coli. One type is a wild type and the other is a lac operon mutant. The lac operon wild type has the genotype: I+P+O+Z+Y+A+ What is a silent mutation? What w...
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...
The genotypes of the lac operon of several haploid and partial diploid E. coli strains are...
The genotypes of the lac operon of several haploid and
partial diploid E. coli strains are given. For each genotype,
indicate the status of B-galactosidase synthesis as either Yes or
No. Assume that no glucose is present and cAMP is rich in the
growth medium.
• Oc is a mutant operator that cannot be bound
by the wild type repressor protein.
• Is is a mutant of repressor gene and cannot
bind to operator
Haploid Partial Diploid IOZY IOCZY ISOZY...
A lac operon mutant is grown in the presence and absence of lactose and tested for...
A lac operon mutant is grown in the presence and absence of lactose and tested for activity of the biosynthesis genes ‘Z’, ‘Y’, and ‘A’. Given the genotype below, which biosynthetic genes would be expressed in the presence of lactose? I+ P+ O+ Z+ Y- A+/ F’ I- P+ O+ Z+ Y- A+ Select one: a. none b. Z, Y, and A c. P and O d. Z and A e. I, P, O, Z, Y, and A
You isolate 20 different OC mutant strains that are wild type for all other components of...
You isolate 20 different OC mutant strains that are wild type for all other components of the Lac Operon. You observe that when grown on lactose all of the strains exhibit a relative B-gal concentration of 100. When each strain is grown on glucose they all exhibit constitutive expression of B-gal, but the different strains exhibit different Bgal concentrations that range from 20 to 100. Which of the following could account for these observations? a) the OC mutant strains each...
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...
Consider the following lac operon genotype: laci+P+OCZY+A+ In an E. coli strain with this genotype, what...
Consider the following lac operon genotype: laci+P+OCZY+A+ In an E. coli strain with this genotype, what is the status of beta- galactosidase activity in the PRESENCE of lactose? O A. - OB. + c. Can't tell
Briefly explain your answers to the following questions. A mutation (Mutation A) in the lac operon...
Briefly explain your answers to the following questions. A mutation (Mutation A) in the lac operon of E. coli leads to an inability to ferment lactose, and the expression of the operon is always off. Introduction into the mutant of an F' factor containing the wild type lac operon does NOT restore the ability to ferment lactose, i.e., there is no expression of the operon from the plasmid either. a. What is the probable nature of Mutation A? Is the...
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...
As a student project, you have isolated six new mutant strains of E. coli with altered...
As a student project, you have isolated six new mutant strains
of E. coli with altered behavior of the lactose operon. The strains
are listed in the table below, together with their phenotypes (with
regard to significant ?-galactosidase synthesis) in three specific
situations.
Columns 1 and 2 present the phenotypes of each mutant haploid
strain. In column 1, the mutant is in an otherwise wild-type
genome. In column 2, the genome also carries a nonsense-suppressor
mutation (that is not present...
In this problem you will explore how to solve problems involving partial diploid lac operon bacterial...
In this problem you will explore how to solve problems involving partial diploid lac operon bacterial strains. Bacterial strains that are "partially diploid" have two copies of the lac operon because they aquired a plasmid carrying just the lac operon region. One copy of the lac operon region is on the recipient's bacterial chromosome, and the other copy is on the F' plasmid that was introduced into the cell by conjugation. Partial diploid genotypes are written with the F' segment...
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 genotypes of the lac operon of several haploid and
partial diploid E. coli strains are given. For each genotype,
indicate the status of B-galactosidase synthesis as either Yes or
No. Assume that no glucose is present and cAMP is rich in the
growth medium.
• Oc is a mutant operator that cannot be bound
by the wild type repressor protein.
• Is is a mutant of repressor gene and cannot
bind to operator
Haploid Partial Diploid IOZY IOCZY ISOZY...
Consider the following lac operon genotype: laci+P+OCZY+A+ In an E. coli strain with this genotype, what is the status of beta- galactosidase activity in the PRESENCE of lactose? O A. - OB. + c. Can't tell
As a student project, you have isolated six new mutant strains
of E. coli with altered behavior of the lactose operon. The strains
are listed in the table below, together with their phenotypes (with
regard to significant ?-galactosidase synthesis) in three specific
situations.
Columns 1 and 2 present the phenotypes of each mutant haploid
strain. In column 1, the mutant is in an otherwise wild-type
genome. In column 2, the genome also carries a nonsense-suppressor
mutation (that is not present...
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