Under which set of conditions does the lac operon in E. coli produce high levels of šššš, šššš, and šššš“ transcripts?
Under which set of conditions does the lac operon in E. coli produce high levels of , , and transcripts? Select all that apply.
in the presence of glucose
in the presence of lactose
in the absence of glucose
in the absence of lactose
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Under which set of conditions does the lac operon in E. coli produce high levels of šššš, šššš, and šššš“ transcripts?
You have systematically mutagenized the lac operon in E. coli to produce a mutation that disrupts...
You have systematically mutagenized the lac operon in E. coli to produce a mutation that disrupts the function of each of the following elements: a. the promoter for LacI (P(I)) āØ b. the LacI gene āØ c. CRP binding site d. the promoter for the lac operon (P(lac)) āØ e. the operator sequence f. a mutation in lacZ that disrupts the coding region but does not disrupt transcription āØ g. a mutation in lacZ that blocks transcription āØāØ For each of the above mutations, what...
In E coli the lac operon will express enzymes for the digestion of (Glucose/Lactose) when it...
In E coli the lac operon will express enzymes for the digestion of (Glucose/Lactose) when it is present, but if both the sugar mentioned before and (Glucose/ Lactose) are present the lac operon is repressed, resulting in the (Glucose/ Lactose) being used first. If there are high levels of cAMP, this means (Glucose/Lactose) levels are low, this results in a (Represser/Promoter) being activated and (Decreasing/Increasing) transcription of the lac operon.
In the table below, predict (yes or no) whether or not the E. coli lac operon...
In the table below, predict (yes or no) whether or not the E. coli lac operon will be transcriptionally active in the presence or absence of glucose or lactose as indicated and respond to questions "a" and "b." (20 points) Lactose Glucose Lac expression? No Yes NO Yes Yes NO Yes No YES 1) Explain each of your answers in terms of the molecular mechanisms that are known to underlie the regulation of the lac operon. 2) Which mechanism is...
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...
The lac operon contains a DNA sequence known as the lac promoter (P or P+ for...
The lac operon contains a DNA sequence known as the lac promoter (P or P+ for wild type; Pā for mutant (RNA polymerase does not bind)) that serves as the RNA polymerase binding site. The lac operon also contains a DNA sequence known as the Lac operator (O or O+ for wild type; Oā or Oc for mutant (lac repressor cannot bind)) which is the binding site for lac repressor. The lac repressor, a protein, is encoded by the lac...
26. The lac operon in E. coli consists of genes that code for enzymes necessary for...
26. The lac operon in E. coli consists of genes that code for enzymes necessary for the breakdown of lactose. When lactose is absent, the operon is inactive because a repressor protein binds to a specific site in the lac operon. When lactose is present, lactose molecules bind to the repressor protein, causing the repressor protein to dissociate from the binding site. In the absence of glucose (a preferred energy source for bacteria), the protein CAP binds to a regulatory...
Most of what we know about the lac operon in E. coli has come from the...
Most of what we know about the lac operon in E. coli has come from the genetic analysis of various mutants. Below is a list of mutants for regions of the operon. A + superscript indicates no mutation and normal function of that region, - indicates a knock out and no function of that region, c indicates the mutation resulted in constitutive action of that region. The effect of the mutation is determined by expression of the lacZ gene as...
15. Describe the gene expression at the lac operon in the following conditions. Please discuss all...
15. Describe the gene expression at the lac operon in the following conditions. Please discuss all components involved and how they regulate the expression: a. Absence of glucose; presence of lactose b. Absence of lactose; presence of glucose
E. coli consumes both glucose and lactose. If both are available, which is preferred? After glucose...
E. coli consumes both glucose and lactose. If both are available, which is preferred? After glucose is consumed, how does the absence of glucose and presence of lactose influence transcription of the lac operon (describe both the roles of the repressor and cAMP).
Under which of the following conditions will transcription of the lac operon occur when the bacteria...
Under which of the following conditions will transcription of the lac operon occur when the bacteria are originally inoculated in a medium containing both glucose and lactose? a) Lactose present/glucose present b) Lactose present/glucose used up c) Lactose absent/glucose present d) Lactose absent/glucose used up e) a and b
26. The lac operon in E. coli consists of genes that code for enzymes necessary for the breakdown of lactose. When lactose is absent, the operon is inactive because a repressor protein binds to a specific site in the lac operon. When lactose is present, lactose molecules bind to the repressor protein, causing the repressor protein to dissociate from the binding site. In the absence of glucose (a preferred energy source for bacteria), the protein CAP binds to a regulatory...
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