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5. Briefly describe positive control in the lac operon when glucose is absent and lactose is...
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,...
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.
1) The lac operon is… a) Positive repressible b) Both negative inducible and positive repressible c)...
1) The lac operon is… a) Positive repressible b) Both negative inducible and positive repressible c) Positive inducible d) Negative inducible 2) An activator regulatory protein… a) Is involved in negative regulatory control b) Is a cis acting regulatory element c) Recruits RNA polymerase to the promoter d) Prevents RNA polymerase from binding the promoter 3) For the lac operon, the presence of the substrate (lactose) activates the repressor. True or False? a) true b) false 4) cAMP… a) Activates...
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
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
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
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.
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure...
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure 28-14). Fill out the table below with No expression, Low/Medium expression, or High expression to summarize when the Lac operon will be expressed in each of the three E. coli strains in the table. An example has been done for you. RNA polymerase- binding site (promoter) CAP binding site start site for RNA synthesis operator Lacz gene -80 -40 14080 nucleotide pairs Figure 08-14...
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...
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; P– 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; O– 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...
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,...
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
3. The CAP activator protein and the Lac repressor both control the Lac operon (see Figure 28-14). Fill out the table below with No expression, Low/Medium expression, or High expression to summarize when the Lac operon will be expressed in each of the three E. coli strains in the table. An example has been done for you. RNA polymerase- binding site (promoter) CAP binding site start site for RNA synthesis operator Lacz gene -80 -40 14080 nucleotide pairs Figure 08-14...
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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