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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the trp operon is an example of… ?
enzyme repression
enzyme induction
catabolite repression
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)
. The tryptophan operon is usually in the _______position and is inhibited by a/an_______ molecule.
on, repressor
off, inducer
on, inducer
off, repressor
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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- Binding of _______ to _______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. repressors; enhancersarrow_forwardIn order for the lac operon to be triggered, lactose must be present and ________. a. cAMP levels low b. glucose stores depleted c. glucose levels higharrow_forwardFor an enzyme to be produced from an inducible operon, the repressor must bind to and digest the substrate. the substrate must bind to the repressor and remove it from the operator. the substrate must bind to the operator. the repressor must be bound to the operator.arrow_forward
- If an operon is controlled by an activator and the substrate of the metabolic pathway then the type of regulation is positive inducible. negative repressible. positive repressible. negative inducible.arrow_forwardWhen lactose is present lactose induces the activation of the genes in the lac operon by binding the repressor lactose represses the activation of the genes in the lac operon by binding the repressor lactose induces the activation of the genes in the lac operon by binding the operator lactose represses the activation of the genes in the lac operon by binding the operatorarrow_forwardIn the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated such that the protein it produces cannot bind to lactose (IS mutation), the lac operon is ________. Group of answer choices repressor; never expressed activator; constitutively expressed inducer; never expressed inducer; constitutively expressed structural gene; never expressedarrow_forward
- In the absence of lactose, the genes of the lac operon are: Not transcribed; because there is no lactose to activate the polymerase Not transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to activate the repressorarrow_forwardIn the tryptophan operon, tryptophan is considered a Group of answer choices coactivator inducer an enhancer corepressor an attenuatorarrow_forwardIf glucose is absent, but lactose is available, the lac operon will be _______arrow_forward
- The 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_forwardA new operon called Terperon is discovered and is not normally transcribed. It is stimulated by the regulatory protein Rutgease. What kind of control is Terperon exhibiting? Group of answer choices Positive repressible Positive inducible Negative repressible Negative induciblearrow_forwardIf tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesizedarrow_forward
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