Describe and sketch in detail the negative and positive regulation of expression of the lac operon...
- Describe and sketch in detail the negative and positive
regulation of expression of the lac operon of E.
coli. How gene expression turned on?
- Negative regulation-
- Positive regulation-
Homework Answers
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Describe and sketch in detail the negative and positive
regulation of expression of the lac operon...
1. Describe in detail how both positive and negative regulation control expression of the lac operon...
1. Describe in detail how both positive and negative regulation control expression of the lac operon in bacteria. In doing this, also convey understanding of how and why expression of this operon is controlled two ways (positive and negative). Also answer, what are the energetic benefits to the cell of operon regulation? 2. What is horizontal gene transfer? Describe in detail the three mechanisms of horizontal gene transfer. What are the evolutionary advantages and costs of horizontal gene transfer. I...
Gene Regulation Describe the regulation of the lac operon in E. coli. a. the structure of...
Gene Regulation Describe the regulation of the lac operon in E. coli. a. the structure of lac operon in E.coli. b. Role of CAP and cAMP the activator binding site c. Role of Lac Repressor and Operator and Inducer d. Role of Looping e. Effect of mutations f. Recessive v dominant mutations g. Complementing v noncomplementing mutations. Describe the regulation of the trp operon in E. coli. Describe at least three kinds of molecular switches involved in gene regulation. What...
Gene expression from the lac operon can be controlled in many ways, including a robust negative regulation strategy.
Gene expression from the lac operon can be controlled in many ways, including a robust negative regulation strategy. Select mutations that would reduce the effectiveness of this negative regulation and increase lac operon activity.
Describe how the Lac repressor and the CAP-cAMP complex regulate the expression of the Lac operon...
Describe how the Lac repressor and the CAP-cAMP complex regulate the expression of the Lac operon in E. coli.
Catabolite repression can regulate the expression of the lac operon in E. coli. In terms of...
Catabolite repression can regulate the expression of the lac operon in E. coli. In terms of this positive regulation of the lac operon: What is the activator? Would it work in cis or trans? What molecule binds to the allosteric domain of the activator? What influences strongly the levels of the molecule you answered for part b? To what regulatory sequence does the activator bind? What part/domain of the activator? What is the effect of this binding? Name the two...
1. If you isolated a mutation that disrupted a positive regulatory gene for the thr operon...
1. If you isolated a mutation that disrupted a positive regulatory gene for the thr operon (which contains the genes needed to synthesize the amino acid threonine), what would the phenotype be? 2. Compare and contrast the positive regulation of expression of the lac operon by the cAMP-CAP complex with the negative regulation of expression of the lac operon by the LacI protein. You should have several similarities and parallel differences. 3. All human beings have a rich growth of...
Complete the comparison of the lac Operon and trp Operons as a means of gene regulation.
ACTIVITY #2: Operon control of gene expressionComplete the comparison of the lac Operon and trp Operons as a means of gene regulation. lac operorn trp operon Regulates production of Name of Regulatory gene" and what it produces What binds to the operator & when does this occur: Structural genes controlled by the operon and how their expression is controlled: High levels of what substance affects the operon how?
A. Describe in detail the regulation of the prokaryotic lac operon for the following environment: Glucose...
A. Describe in detail the regulation of the prokaryotic lac operon for the following environment: Glucose is present, lactose present, & the repressor protein is mutated such that the allosteric site is non-functional and can no longer bind its substrate. Be sure to specify the presence or absence and location of Lac I, allolactose, cAMP, CAP, and RNA polymerase. B. Indicate whether transcription is occurring at a basal level, a high level, or not at all.
Concerning the lac operon in prokaryotic gene regulation, describe what a polycistronic message is and its...
Concerning the lac operon in prokaryotic gene regulation, describe what a polycistronic message is and its significance.
b. What is the polycistron in the Lac operon? In the Trp operon? d. Name an aspect of...
b. What is the polycistron in the Lac operon? In the Trp operon? d. Name an aspect of prokaryotic gene regulation that can only occur in a prokaryote and not a eukaryote e. Provided the wildtype lac operon, give three different examples of mutations, what they target, and how they disrupt WT regulation of the operon. f. Describe how the RNA leader of the Trp operon can repress/induce gene translation
1. Describe in detail how both positive and negative regulation control expression of the lac operon in bacteria. In doing this, also convey understanding of how and why expression of this operon is controlled two ways (positive and negative). Also answer, what are the energetic benefits to the cell of operon regulation? 2. What is horizontal gene transfer? Describe in detail the three mechanisms of horizontal gene transfer. What are the evolutionary advantages and costs of horizontal gene transfer. I...
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