Homework Answers
Attenuation of transcription regardless of tryptophan
levels.
If the formartion of the 2+3 antiterminator loop is prevented by
the mutation,The trp operon is regulated by repression and
attentuation. formation of 2+3 stem loop precludes the formation of
3+4 attenuation loop and the transcription proceed through trp
genes.
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If a mutation prevents the formation of the antiterminator 2+3...
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...
Trp Operon 5. The rate of transcription of the trp operon in E. coli is controlled by both repression and attenuation dr papde ia) Alternate secondary structures formed by the trpl tranecript Alterna...
Trp Operon 5. The rate of transcription of the trp operon in E. coli is controlled by both repression and attenuation dr papde ia) Alternate secondary structures formed by the trpl tranecript Alternate 2 Regions 2 and 3 Atemate 1: Regions 1 and 2 basepared and regions 3 and 4 basepsired 54 140 Stop codon Transcribtion termination hairpin can NOT form a) Diagram and explain repression and attenuation regulatory mechanisms for the trp operon when tryptophan is present and absent....
1. The terminating "hairpin" loop occurs in the tryptophan operon when ________. A. sufficient glucose is...
1. The terminating "hairpin" loop occurs in the tryptophan operon when ________. A. sufficient glucose is present. B. sufficient tryptophan is present. C. insufficient tryptophan is present. D. insufficient glucose is present. E. None of the above 2. When tryptophan is present in the medium and available to the bacterium, ________. A. the repressor is inactive and the tryptophan operon is "off" B. the repressor is inactive and the tryptophan operon is "on" C. the repressor is bound to the...
stion 4 of 8 Map Genetics: A Conceptual Approach Reading Quiz ieroe 6th Edition MHE/Freeman by...
stion 4 of 8 Map Genetics: A Conceptual Approach Reading Quiz ieroe 6th Edition MHE/Freeman by Saplina Leary Use the information gathered in the Attenuation Animation to answer the following question. What effect on the expression of the trp operon might you expect if the stretch of T.A base pairs following region 4 were deleted? O The entire trp operon will be transcribed no matter what the level of tryptophan in the cell. The leader sequence of the trp operon...
Page < 2 > of 2 D. The trp operon would be expressed at high levels,...
Page < 2 > of 2 D. The trp operon would be expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance of trp B. The trp operon would be transcribed much less than...
Which of the following is NOT expected when a eukaryotic cell is deprived from Oxygen? Question...
Which of the following is NOT expected when a eukaryotic cell is deprived from Oxygen? Question 40 Not yet answered Points out of 2.50 P Flag question Select one: O a. The formation of CO2 from cell respiration stops o b. Reduction of the production of ATP by substrate level phosphorylation in the mitochondria c. All listed events are expected in a eukaryotic cell deprived of oxygen O d. The cell reduces pyruvate (fermentation) to allow the ETC to continue...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? ...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? 2. Illustrate it. Include: RNA repressors erase, repressors, and any other molecules needed to show how this worke. GENE TURNED ON -+ + +- Promoter OperatorStructural Genes 3. What happens to transcription at the trp operon when trypto 4. Illustrate it. Include: RNA polymerase, e, repressors and any other molecules needed to show the following GENE TURNED OFF Promoter Operator Structural Genes Circle...
If we placed a bacterium into a medium that contained neither lactose nor glucose (let's give...
If we placed a bacterium into a medium that contained neither lactose nor glucose (let's give them arabinose instead), what will be the level of transcription from the lac operon? O A OFF (fully repressed, but not activated) O B BASAL (neither repressed nor activated) O C HIGH (not repressed, but activated) O D OFF (both repressed and activated, but the repressor "wins") Under what conditions do we get maximum transcription from the lac operon? O A When both glucose...
3. Consider a hypothetical strain of E. coli (strain 401) that contains two mutations that affect...
3. Consider a hypothetical strain of E. coli (strain 401) that contains two mutations that affect tryptophan biosynthesis. The first mutation is a single nucleotide substitution that converts the second tandem Trp codon in region 1 of the Trp leader sequence into a stop codon (see slides 2-7 of Lecture 24 on iLearn) trp structural genes trpE trpD trpC trpB trpA PO Trp Leader Met-Lys-Ala-lle-Phe-Val-Leu-Lys-Gly-Trp-Trp-Arg-Thr Ser- Stop Assume that strain 401 also contains a mutation in the gene for 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...
Trp Operon 5. The rate of transcription of the trp operon in E. coli is controlled by both repression and attenuation dr papde ia) Alternate secondary structures formed by the trpl tranecript Alternate 2 Regions 2 and 3 Atemate 1: Regions 1 and 2 basepared and regions 3 and 4 basepsired 54 140 Stop codon Transcribtion termination hairpin can NOT form a) Diagram and explain repression and attenuation regulatory mechanisms for the trp operon when tryptophan is present and absent....
stion 4 of 8 Map Genetics: A Conceptual Approach Reading Quiz ieroe 6th Edition MHE/Freeman by Saplina Leary Use the information gathered in the Attenuation Animation to answer the following question. What effect on the expression of the trp operon might you expect if the stretch of T.A base pairs following region 4 were deleted? O The entire trp operon will be transcribed no matter what the level of tryptophan in the cell. The leader sequence of the trp operon...
Page < 2 > of 2 D. The trp operon would be expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance of trp B. The trp operon would be transcribed much less than...
Which of the following is NOT expected when a eukaryotic cell is deprived from Oxygen? Question 40 Not yet answered Points out of 2.50 P Flag question Select one: O a. The formation of CO2 from cell respiration stops o b. Reduction of the production of ATP by substrate level phosphorylation in the mitochondria c. All listed events are expected in a eukaryotic cell deprived of oxygen O d. The cell reduces pyruvate (fermentation) to allow the ETC to continue...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? 2. Illustrate it. Include: RNA repressors erase, repressors, and any other molecules needed to show how this worke. GENE TURNED ON -+ + +- Promoter OperatorStructural Genes 3. What happens to transcription at the trp operon when trypto 4. Illustrate it. Include: RNA polymerase, e, repressors and any other molecules needed to show the following GENE TURNED OFF Promoter Operator Structural Genes Circle...
If we placed a bacterium into a medium that contained neither lactose nor glucose (let's give them arabinose instead), what will be the level of transcription from the lac operon? O A OFF (fully repressed, but not activated) O B BASAL (neither repressed nor activated) O C HIGH (not repressed, but activated) O D OFF (both repressed and activated, but the repressor "wins") Under what conditions do we get maximum transcription from the lac operon? O A When both glucose...
3. Consider a hypothetical strain of E. coli (strain 401) that contains two mutations that affect tryptophan biosynthesis. The first mutation is a single nucleotide substitution that converts the second tandem Trp codon in region 1 of the Trp leader sequence into a stop codon (see slides 2-7 of Lecture 24 on iLearn) trp structural genes trpE trpD trpC trpB trpA PO Trp Leader Met-Lys-Ala-lle-Phe-Val-Leu-Lys-Gly-Trp-Trp-Arg-Thr Ser- Stop Assume that strain 401 also contains a mutation in the gene for the...
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