Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 16, Problem 7RQ
If glucose is absent, but so is lactose, the lac operon will be.
- activated
- repressed
- activated, but only partially
- mutated
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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)
In the presence of lactose and the presence of glucose the lac operon is
not expressed
Lacl is
bound
to the operator and CAP is
not bound
to the CAP binding site.
Which of the following conditions is most likely to result in an increase
rate of transcription of the lac operon?
when lactose is present AND the repressor is permanently attached to the
operator
when lactose is present and there is high levels of glucose
when lactose is absent and there are low levels of glucose
when lactose is present and there are low levels of glucose
Chapter 16 Solutions
Biology 2e
Ch. 16 - Figure 16.5 In E. coli, the tip operon is on by...Ch. 16 - Figure 16.7 In females, one of the two X...Ch. 16 - Figure 16.13 An increase in phosphorylation levels...Ch. 16 - Control of gene expression in eukaryotic cells...Ch. 16 - Post-translational control refers to: regulation...Ch. 16 - How does the regulation of gene expression support...Ch. 16 - If glucose is absent, but so is lactose, the lac...Ch. 16 - Prokaryotic cells lack a nucleus. Therefore, the...Ch. 16 - The a/a operon is an inducible operon that...Ch. 16 - What are epigenetic modifications? the addition of...
Ch. 16 - Which of the following are true of epigenetic...Ch. 16 - The binding of _____ is required for transcription...Ch. 16 - What will result from the binding of a...Ch. 16 - A scientist compares the promoter regions of two...Ch. 16 - Which of the following are involved in post...Ch. 16 - Binding of an RNA binding protein will the...Ch. 16 - An unprocessed pre-mRNA has the following...Ch. 16 - IS. Alternative splicing has been estimated to...Ch. 16 - Post-translational modifications of proteins can...Ch. 16 - A scientist mutates elF-2 to eliminate its GTP...Ch. 16 - Cancer causing genes are called transformation...Ch. 16 - Targeted therapies are used in patients with a set...Ch. 16 - Name two differences between prokaryotic and...Ch. 16 - Describe how controlling gene expression will...Ch. 16 - Describe how transcription in prokaryotic cells...Ch. 16 - What is the difference between a repressible and...Ch. 16 - In cancer cells, alteration to epigenetic...Ch. 16 - A scientific study demonstrated that rat mothering...Ch. 16 - Some autoimmune diseases show a positive...Ch. 16 - A mutation within the promoter region can alter...Ch. 16 - What could happen if a cell had too much of an...Ch. 16 - A scientist identifies a potential transcription...Ch. 16 - Describe how RBPs can prevent miRNAs from...Ch. 16 - How can external stimuli alter...Ch. 16 - Protein modification can alter gene expression in...Ch. 16 - Alternative forms of a protein can be beneficial...Ch. 16 - Changes in epigenetic modifications alter the...Ch. 16 - A scientist discovers a virus encoding a Protein X...Ch. 16 - New drugs are being developed that decrease DNA...Ch. 16 - How can understanding the gene expression pattern...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following is true about the Lac operon? Group of answer choices An operon with a constitutive operator (O^C mutation) will transcribe in the presence of a super repressor It is a positive repressible operon that is influenced mainly by fluctuations in glucose levels Produces a large quantity of tryptophan in order to synthesize lactase It is found in eukaryotes and is responsible for creating an enzyme that breaks down lactosearrow_forwardWhich of the following is the true inducer of the lac operon? galactose glucose lactose CAMP allolactose Ⓒarrow_forwardWhat are the effects of the following conditions on Lac operon of bacteria? Please do not forget to mention about the role of repressor, activator, RNA polymerase in each case. Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absentarrow_forward
- In the absence of lactose and the presence of glucose the lac operon is strongly expressed Lacl is not bound bound to the CAP binding site. to the operator and CAP isarrow_forwardFor the lac operon, when glucose is absent and lactose is present ___________ None of the options cAMP-CAP is bound to the operator and the repressor is not bound to the promoter cAMP-CAP is not bound to the promoter and the repressor is bound to the operator cAMP-CAP is bound to the promoter and the repressor is not bound to the operatorarrow_forwardThe regulation of the lac operon in E. coli by Catabolite Activator Protein and glucose is an example of what type of regulation? Group of answer choices Positive inducible Positive repressible Negative inducible Negative repressible Constitutivearrow_forward
- In the presence of lactose and the presence of glucose the lac operon is not expressed . Lacl is [ Select ] to the operator and CAP is [ Select ] to the CAP binding site.arrow_forwardexternal lactose cell membrane on RNA polymerase promoter lactose permease B-galactosidase allolactose lac repressor mRNA operator lacZ lacY lacA lac Operon When glucose is present along with the presence of lactose, the lac operon would be: offarrow_forwardWhich of the following statements about the lactose operon in E. coli is TRUE? It contains the genes that encode the proteins for lactose metabolism. Its transcription is blocked when allolactose binds to the lac repressor. It contains a promoter, an operator and an attenuator. It is barely transcribed, when lactose is present in the medium and glucose is absent. It is transcribed at very high levels, when lactose is absent, and glucose is present.arrow_forward
- Which of the following mutations would result in the highest level of lac operon transcription in the absence of lactose? lacY- lacA- lac Z- lac IS lac OCarrow_forwardE. coli is given lactose as a nutrient source. This results in the activation of the lac operon only in the presence of glucose deactivation of the lac operon only in the absence of glucose deactivation of the lac operon only in the presence of glucose activation of the lac operon only in the absence of glucose Question 25 Transduction occurs when a cell takes up DNA from the environment cells are stressed a virus transfers DNA to a cell an F+ cell transfers one strand of DNA to an F- cell MacBearrow_forwardThe figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented.arrow_forward
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