Which molecule involved with the lac operon senses glucose levels? Which senses lactose levels?
Which molecule involved with the lac operon senses glucose levels? Which senses lactose levels?
Homework Answers
Ans. In lac operon which is present in the E. coli, the molecule that is involved in sensing of glucose level is CAP molecules. CAP stands for Catabolite Activator Proteins. It senses the glucose when glucose level is very low and then activates the transcription of the operon. CAP does not sense the glucose level directly but through the cAMP molecules indirectly. cAMP molecules is also called as the hunger signal.
The lactose level in the lac operon is sensed by the lac repressor. The lac operon is generally blocked by the lac repressor but when the lactose is present, it stops acting as the repressor. lac repressor sense lactose level indirectly through allolactose.
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Which molecule involved with the lac operon senses glucose
levels? Which senses lactose levels?
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.
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high...
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high glucose d) Low lactose, low glucose e) None of the above would have any lac operon expression 2. (2 points) Which of the following is true concerning molecular genetics? a) tRNA carries amino acids into the nucleus in eukaryotic cells b) DNA polymerase moves towards the...
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
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.
In the presence of lactose an inducer molecule binds to the lac repressor molecule. the lac...
In the presence of lactose an inducer molecule binds to the lac repressor molecule. the lac repressor binds to the operator. genes of the lac operon are not expressed. all of the choices.
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...
Under which set of conditions does the lac operon in E. coli produce high levels of ππππ, ππππ, and ππππ΄ transcripts?
Under which set of conditions does the lac operon in E. coli produce high levels of ππππlacZ, ππππlacY, and ππππ΄lacA transcripts? Select all that apply.in the presence of glucosein the presence of lactosein the absence of glucosein the absence of lactose
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 β’ lactose is present lactose is absent glucose is present glucose is absent
The diagram below illustrates the LAC operon in its OFF state when the inducer molecule βlactoseβis...
The diagram below illustrates the LAC operon in its OFF state when the inducer molecule βlactoseβis absent. Predict the ways in which the following conditions will affect the transcription of the lactose-utilization genes. OPERON Regulatory Promoter Operator_ gene Lactose-utilization genes DNA mRNA RNA polymerase cannot attach to promoter Active repressor Protein If a mutation in the regulatory gene results in a misfolding of the repressor protein so that it can no longer bind DNA, the lactose-utilization genes O Will be...
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high glucose d) Low lactose, low glucose e) None of the above would have any lac operon expression 2. (2 points) Which of the following is true concerning molecular genetics? a) tRNA carries amino acids into the nucleus in eukaryotic cells b) DNA polymerase moves towards the...
5. Briefly describe positive control in the lac operon when glucose is absent and lactose is present in high amounts.
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 β’ lactose is present lactose is absent glucose is present glucose is absent
The diagram below illustrates the LAC operon in its OFF state when the inducer molecule βlactoseβis absent. Predict the ways in which the following conditions will affect the transcription of the lactose-utilization genes. OPERON Regulatory Promoter Operator_ gene Lactose-utilization genes DNA mRNA RNA polymerase cannot attach to promoter Active repressor Protein If a mutation in the regulatory gene results in a misfolding of the repressor protein so that it can no longer bind DNA, the lactose-utilization genes O Will be...
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