Explain and give examples of Inducible & Repressible Operons. Describe what types of protein products or pathways each controls, and explain why this is appropriate. ** Illustrate and EXPLAIN both Positive and Negative Control!! **

Explain and give examples of Inducible & Repressible Operons. Describe what types of protein products or pathways each controls, and explain why this is appropriate. Illustrate and EXPLAIN both Positive and Negative Control!!

Name: Explain and give examples of Inducible & Repressible Operons. Describe
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Description: Explain and give examples of Inducible & Repressible Operons. Describe what types of protein products or pathways each controls, and explain why this is appropriate. ** Illustrate and EXPLAIN both Positive and Negative Control!! **

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 12TYU: PREDICT Compare the types of bacterial genes associated with inducible operons, those associated...

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INTERPRET DATA Develop a simple hypothesis that would explain the behavior of each of the following types of mutants in E. coli. Mutant a: The map position of this mutation is in the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if large amounts of tryptophan are present in the growth medium. Mutant b: The map position of this mutation is in the trp operon. The mutant cells do not produce any enzymes coded for by the trp operon under any conditions. Mutant c: The map position of this mutation is some distance from the trp operon. The mutant cells are constitutive; that is, they produce all the enzymes coded for by the trp operon, even if the growth medium contains large amounts of tryptophan.
Which of the following is characteristic of genes and gene regulation in both bacteria and eukaryotes? (a) promoters (b) non-coding DNA within coding sequences (c) enhancers (d) operons (e) DNA located in a nucleus
PREDICT Compare the types of bacterial genes associated with inducible operons, those associated with repressible operons, and those that are constitutive. Predict the category into which each of the following would most likely fit: (a) a gene that codes for RNA polymerase, (b) a gene that codes for an enzyme required to break down maltose, and (c) a gene that codes for an enzyme used in the synthesis of adenine.
A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcription
know what an operon is and the elements of the operon model; know the function of each of these elements (regulator, operator, promoter, structural genes); know the differences between inducible and repressible operons
What exactly is an “operon”? Briefly formulate your own definition of an operon. Include its function and cis-regulatory elements. Can you please explain in details
Using the lac operon as a model, explain the role of inducers, repressors, and inducer exclusion.
In your own words describe in detail what happens at the lac operon in each of the following situations Lactose, no glucose (high cAMP) No lactose or glucose (high cAMP) Lactose and glucose (low cAMP) Glucose, no lactose (low cAMP)
Consider the following scenario: A bacteria cell is surrounded by lactose, but there is no glucose readily available. Will the lac operon be active (on) or inactive (off)? Explain in your own words. If it is active, describe the levels (low or high) of transcription, and any positive regulators assisting with this. If it is inactive, describe the negative regulators assisting with this, and how the operon could be turned on. Question 48 options:
Tonly in cell biology the Lac operon in bacteria encodes proteins required to import and digest the disaccharide lactose in the absence of glucose. Lac operon is highly expressed only when two conditions are met: glucose must be absent and lactose must be present. Bacteria solves this issue by employing both an activator and a repressor for the same operon. But how? A Bacteria can turn on Lac operon even if the repressor is bound to the operator region. B When the two conditions are met repressor will not be present, activator will be active. Thus the operon will be ON. C Operon is always on when the repressor is not bound. D Operon will be off when the activator is bound and repressor is not. E Activators itself inhibit repressors from binding to operators.
If glucose levels in the cell are high and lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?
Study the depiction of the lac operon in Figure 11.2. Normally, the genes are turned off when lactose is not present. Lactose activates the genes, which code for enzymes that enable the cell to use lactose. Mutations can alter the function of this operon. Predict how the following mutations would affect the function of the operon in the presence and absence of lactose: a. mutation of regulatory gene; repressor will not bind to lactose b. mutation of operator; repressor will not bind to operator c. mutation of regulatory gene; repressor will not bind to operator d. mutation of promoter; RNA polymerase will not attach to promoter