Homework Answers
It would be impossible to turn the lac operon on even in the presence of lactose because the repressor protein would remain bound to the operator site.
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e ansecey e 7. If an abnomal repressor protein could still bind allolactosc, but the binding...
3. Mutations in bacteria that affect gene regulation may have a cis- or trans-effect on the...
3. Mutations in bacteria that affect gene regulation may have a cis- or trans-effect on the expression of the protein-encoding genes in an operon? How would the following mutations affect the expression of the lac operon? Assume there could be more than one lac operon in the cell and that no glucose is present. A. A mutation in the operator site that prevents the lac repressor from binding. B. A mutation in the lacI gene that prevents allolactose from binding,...
Allolactose acts as a signal molecule that binds to the LacI protein (repressor) and prevents it...
Allolactose acts as a signal molecule that binds to the LacI protein (repressor) and prevents it from binding to the Operator on the lac operon. But if the repressor is on the operator, no B-glactosidase can be made which means no allolactose can be made in the first place. So how is the repressor removed so allolactose can be made to stop the repressor from binding?
Lactose (or rather, its derivative allolactose) can lift the Lac Repressor protein from the Operator site...
Lactose (or rather, its derivative allolactose) can lift the Lac Repressor protein from the Operator site in DNA, thus allowing for expression of the genes coded by the Lac Operon. However, lactose cannot cross the bacterial cell membrane without the help of the Permease protein channel, which is coded by the lacY gene in the Lac Operon. So, it appears that we have a case of "what's first, the chicken or the egg?" - how can lactose enter the cell...
In terms of the Trpoperon, where would the Trp operon repressor protein most likely bind? Drag...
In terms of the Trpoperon, where would the Trp operon repressor protein most likely bind? Drag the "Trprepressor" label to the location where that repressor protein is most likely to bind and exert its effect on the system. (A Trprepressor Trp operon Trp operator F D C B A E. coli DNA promoter mRNA molecule series of enzymes required for tryptophan biosynthesis
all them please Question 23 (1 point) The A and B alleles in ABO blood types...
all them please
Question 23 (1 point) The A and B alleles in ABO blood types can give rise to an individual that is blog type AB. This specific blood type is an example of: A) multiple alleles B) epistasis C) codominance D) partial dominance Imagine the gene encoding the lac repressor was mutated so that lactose (more technically allolactose) no longer bound to the repressor. However, the lac repressor was still capable of binding DNA at the operator sequence....
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure...
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure 28-14). Fill out the table below with No expression, Low/Medium expression, or High expression to summarize when the Lac operon will be expressed in each of the three E. coli strains in the table. An example has been done for you. RNA polymerase- binding site (promoter) CAP binding site start site for RNA synthesis operator Lacz gene -80 -40 14080 nucleotide pairs Figure 08-14...
7. How does a repressor protein turn off the lac operon? 8. How does lactose turn...
7. How does a repressor protein turn off the lac operon? 8. How does lactose turn on the lac operon? 9. Complete the table to describe the role of each regulatory region or molecule in the operation of the lac operon.
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...
The gene machine program shows you what happens when lactose is present in E. coli, and...
The gene machine program shows you what happens when lactose is present in E. coli, and how the lac operon is under negative control. However, the lac operon is also under positive control from a protein called CRP, eAMP Receptor Protein. The absence of the lac repressor is essential but not sufficient for effective transcription of the lac operon. RNA polymerase also depends on the presence of CRP. Like the lac repressor, which can bind to the DNA and lactose....
A mutation in the operator of the trp operon prevents the repressor to bind to the...
A mutation in the operator of the trp operon prevents the repressor to bind to the operator, even in the presence of tryptophan. What is true with respect to the bacteria carrying this mutation? Select one: a. The bacteria will transcribe the genes of the trp operon even when tryptophan is present in the environment b. Tryptophan would not be able to bind to the repressor protein c. Small amounts of tryptophan will be lethal for the bacteria d. The...
In terms of the Trpoperon, where would the Trp operon repressor protein most likely bind? Drag the "Trprepressor" label to the location where that repressor protein is most likely to bind and exert its effect on the system. (A Trprepressor Trp operon Trp operator F D C B A E. coli DNA promoter mRNA molecule series of enzymes required for tryptophan biosynthesis
all them please
Question 23 (1 point) The A and B alleles in ABO blood types can give rise to an individual that is blog type AB. This specific blood type is an example of: A) multiple alleles B) epistasis C) codominance D) partial dominance Imagine the gene encoding the lac repressor was mutated so that lactose (more technically allolactose) no longer bound to the repressor. However, the lac repressor was still capable of binding DNA at the operator sequence....
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure 28-14). Fill out the table below with No expression, Low/Medium expression, or High expression to summarize when the Lac operon will be expressed in each of the three E. coli strains in the table. An example has been done for you. RNA polymerase- binding site (promoter) CAP binding site start site for RNA synthesis operator Lacz gene -80 -40 14080 nucleotide pairs Figure 08-14...
7. How does a repressor protein turn off the lac operon? 8. How does lactose turn on the lac operon? 9. Complete the table to describe the role of each regulatory region or molecule in the operation of the lac operon.
The gene machine program shows you what happens when lactose is present in E. coli, and how the lac operon is under negative control. However, the lac operon is also under positive control from a protein called CRP, eAMP Receptor Protein. The absence of the lac repressor is essential but not sufficient for effective transcription of the lac operon. RNA polymerase also depends on the presence of CRP. Like the lac repressor, which can bind to the DNA and lactose....
A mutation in the operator of the trp operon prevents the repressor to bind to the operator, even in the presence of tryptophan. What is true with respect to the bacteria carrying this mutation? Select one: a. The bacteria will transcribe the genes of the trp operon even when tryptophan is present in the environment b. Tryptophan would not be able to bind to the repressor protein c. Small amounts of tryptophan will be lethal for the bacteria d. The...
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