Homework Answers
Answer: Options A
and F are correct
Explanation:
The operon produces the polycistronic mRNA.
Since beta-galactosidase and permease are produced, there is no
misregulation at the transcriptional level. i.e. the defect cannot
be in the LacI, promoter, or operator.
LacA is not produced: This could be
due to a mutation in the coding sequence of LacA which creates a
premature translation termination codon.
If there is a nonsense codon produced at the end of the LacY coding
sequence, it will also result in no-production of lacA
protein.
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on strain is found that synthesizes B-galactosidase and permease but no B-galactoside-transacetylase in the presence of...
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
the answer I gave was wrong A mutant E. coli strain is found that synthesizes B-galactosidase...
the answer I gave was wrong
A mutant E. coli strain is found that synthesizes B-galactosidase whether or not lactose (or allolactose) is present. What mutations can independently lead to this outcome? The lac operon is shown here as a guide. zones where proteins bind DNA: genes and regulatory sequences lac 1 operator promoter -35 lac z lac Y lac A JOSSA expression Lac repressor B-galactosidase B-galactoside- transacetylase proteins permease Lac Z Lac A promoter operator laci Lac Y
D Question 21 A mutant E.coli strain is found that synthesizes 8-galactosidase and permease but no...
D Question 21 A mutant E.coli strain is found that synthesizes 8-galactosidase and permease but no B-galactoside-transcetylase in the presence of lactose for lactose. What mutations can lead to this outcome! The lac operon is shown here as a guide DNA and regulatory sequences promoter Z Orto • Previous
The lac operon contains three genes: lacZ, lacY, and lacA for β‑galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively.
The lac operon contains three genes: lacZ, lacY, and lacA for β‑galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively. The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene.The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. Determine which events...
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
20862a a A mutant E. coli strain is found that does not synthesize any enzymes in...
20862a a A mutant E. coli strain is found that does not synthesize any enzymes in the presence or absence of lactose for allolactose). What mutation(s) can lead to this outcome? The lac operon is shown here as a guide. ones where proteins bind DNA genes and regulatory sequences och Operator o Lacy o Lacz o Laca promoter MacBook Air * जीप
Lac Promoter i promoter galactoside transacetylase gene E coll chromosome lac operon loc terminator regulatory gene...
Lac Promoter i promoter galactoside transacetylase gene E coll chromosome lac operon loc terminator regulatory gene Operator site (laco) CAP site Lactose permease gene Beta-galactosidase gene
which operon will make b-galactosidase even if lactose isn't present? p+ o+ lacZ+ lacI- p- Oc...
which operon will make b-galactosidase even if lactose
isn't present?
p+ o+ lacZ+ lacI-
p- Oc lacZ+ lacI-
p+ Oc lacZ- lacI+
p- o+ lacZ+ lacI+
p+ o+ lacZ+ lacI+
Oc = fails to bind R
regulatory promoter operator gene structural genes lacz lacY lacA β-galactosidase thiogalactoside transacetylase lactose permease
Background: Several genetic regions are needed for lactose metabolism: P(promoter), O(operator), lacZ(b-galactosidase gene), lacY(permease gene), lacA(transacetylase...
Background: Several genetic regions are needed for lactose
metabolism: P(promoter), O(operator), lacZ(b-galactosidase gene),
lacY(permease gene), lacA(transacetylase gene) and lacI(repressor
gene). Strains can be defined as having + - c or s copies: + refers
to the functional version, - refers to a defect version, c refers
to a constitutively active version and s refers to a superrepressor
version. Each strain may or may not have an extra-chromosomal
plasmid containing the genes indicated. TA=transacetylase
it would be very helpful if you...
for 1-5 define those The Lac operon is an inducible set of genes found in bacteria...
for
1-5 define those
The Lac operon is an inducible set of genes found in bacteria cells that helps the bacteria to metabolize the disaccharide lactose. When it is turned on it produces proteins that pump lactose into the bacteria cell and break it down into glucose and galactose, which can then be used by the bacteria as a source of energy The two figures below show the Lac Operon along with the lacl gene (which regulates the Lac operon...
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
the answer I gave was wrong
A mutant E. coli strain is found that synthesizes B-galactosidase whether or not lactose (or allolactose) is present. What mutations can independently lead to this outcome? The lac operon is shown here as a guide. zones where proteins bind DNA: genes and regulatory sequences lac 1 operator promoter -35 lac z lac Y lac A JOSSA expression Lac repressor B-galactosidase B-galactoside- transacetylase proteins permease Lac Z Lac A promoter operator laci Lac Y
D Question 21 A mutant E.coli strain is found that synthesizes 8-galactosidase and permease but no B-galactoside-transcetylase in the presence of lactose for lactose. What mutations can lead to this outcome! The lac operon is shown here as a guide DNA and regulatory sequences promoter Z Orto • Previous
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
20862a a A mutant E. coli strain is found that does not synthesize any enzymes in the presence or absence of lactose for allolactose). What mutation(s) can lead to this outcome? The lac operon is shown here as a guide. ones where proteins bind DNA genes and regulatory sequences och Operator o Lacy o Lacz o Laca promoter MacBook Air * जीप
Lac Promoter i promoter galactoside transacetylase gene E coll chromosome lac operon loc terminator regulatory gene Operator site (laco) CAP site Lactose permease gene Beta-galactosidase gene
which operon will make b-galactosidase even if lactose
isn't present?
p+ o+ lacZ+ lacI-
p- Oc lacZ+ lacI-
p+ Oc lacZ- lacI+
p- o+ lacZ+ lacI+
p+ o+ lacZ+ lacI+
Oc = fails to bind R
regulatory promoter operator gene structural genes lacz lacY lacA β-galactosidase thiogalactoside transacetylase lactose permease
Background: Several genetic regions are needed for lactose
metabolism: P(promoter), O(operator), lacZ(b-galactosidase gene),
lacY(permease gene), lacA(transacetylase gene) and lacI(repressor
gene). Strains can be defined as having + - c or s copies: + refers
to the functional version, - refers to a defect version, c refers
to a constitutively active version and s refers to a superrepressor
version. Each strain may or may not have an extra-chromosomal
plasmid containing the genes indicated. TA=transacetylase
it would be very helpful if you...
for
1-5 define those
The Lac operon is an inducible set of genes found in bacteria cells that helps the bacteria to metabolize the disaccharide lactose. When it is turned on it produces proteins that pump lactose into the bacteria cell and break it down into glucose and galactose, which can then be used by the bacteria as a source of energy The two figures below show the Lac Operon along with the lacl gene (which regulates the Lac operon...
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