When glucose is used up, lactose will be used as carbon source. The lac operon will...
When glucose is used up, lactose will be used as carbon source. The lac operon will be ____________
a.) Repressed
b.) Activated
c.) Inactivated
Homework Answers
b is the correct answer because Lac operon will be activated because gene of lac operon are needed for breaking lactose and use it as carbon source.
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When glucose is used up, lactose will be used as carbon source.
The lac operon will...
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.
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...
help pleaseee In the lac operon, positive control occurs through the presence of the CAMP-CAP complex....
help pleaseee
In the lac operon, positive control occurs through the presence of the CAMP-CAP complex. This complex is not available in the presence of glucose. this would mean that: When lactose is present, the lac operon will be activated only if glucose is absent When lactose is absent, the lac operon will be activated only if glucose is also present When lactose is present, the lac operon will not be activated regardless of glucose presence When lactose is present,...
5. Briefly describe positive control in the lac operon when glucose is absent and lactose is...
5. Briefly describe positive control in the lac operon when glucose is absent and lactose is present in high amounts.
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
5. Jacob, Monod, and Pardee used various E.coli mutants to help determine how the lac operon...
5. Jacob, Monod, and Pardee used various E.coli mutants to help determine how the lac operon is regulated. The descriptions of some of the mutants are listed. For each E. coli mutant determine if the lac operon would be on or off in a lactose-only environment. laci mutant: This mutant produces a super repressor that is not inactivated by allolactose. It will still stick. Operater will be off, lacO mutant: This mutant has an altered operator sequence so that the...
The lac operon codes for enzymes that break down lactose, but this operon is only used...
The lac operon codes for enzymes that break down lactose, but this operon is only used when needed. This includes: 1. When the repressor is bound at the operator 2.When RNA polymerase is bound to the promotor WITHOUT the CAP molecule 3.When the CAP and cAMP molecules are bound to the RNA polymerase and lactose is bound to the repressor 4.When the CAP and cAMP molecules are bound to the RNA polymerase and lactose is NOT bound to the repressor
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...
A mutation occurs in the operator of the Lac Operon. Because of this mutation, the Lac...
A mutation occurs in the operator of the Lac Operon. Because of this mutation, the Lac Repressor is unable to bind to the operator. If a bacterial cell contained this mutation, would the Lac operon be transcribed at a high rate (be on) or off under the following conditions: Write on or off in the blank next to each of the conditions. + glucose + lactose ________ + glucose - lactose ________ - glucose + lactose ________ - glucose -...
The Lac operon codes for enzymes that break down lactose so that bacteria can use it...
The Lac operon codes for enzymes that break down lactose so that bacteria can use it in cellular respiration. The repressor detects whether and prevents RNA polymerase from transcribing the operon • lactose is present lactose is absent glucose is present glucose is absent
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...
help pleaseee
In the lac operon, positive control occurs through the presence of the CAMP-CAP complex. This complex is not available in the presence of glucose. this would mean that: When lactose is present, the lac operon will be activated only if glucose is absent When lactose is absent, the lac operon will be activated only if glucose is also present When lactose is present, the lac operon will not be activated regardless of glucose presence When lactose is present,...
5. Briefly describe positive control in the lac operon when glucose is absent and lactose is present in high amounts.
5. Jacob, Monod, and Pardee used various E.coli mutants to help determine how the lac operon is regulated. The descriptions of some of the mutants are listed. For each E. coli mutant determine if the lac operon would be on or off in a lactose-only environment. laci mutant: This mutant produces a super repressor that is not inactivated by allolactose. It will still stick. Operater will be off, lacO mutant: This mutant has an altered operator sequence so that the...
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...
The Lac operon codes for enzymes that break down lactose so that bacteria can use it in cellular respiration. The repressor detects whether and prevents RNA polymerase from transcribing the operon • lactose is present lactose is absent glucose is present glucose is absent
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