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 26CTQ
What is the difference between a repressible and an inducible operon?
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What is a negative inducible operon?
What are the major differences between an operon and a regulon?
Gene expression in bacteria is controlled by the operon model.
a) Why is the operon model important?
b) Why is the trp operon known as a repressible operon?
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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- What is an operon? Describe the functions of regulators, promoters,and operators.arrow_forwardWhat is an operon? Explain an inducible operon.arrow_forwardIf you add a co-eepressor to a repressor protein and that allows it to bind the operator is this a inducible, constitutive or repressible operon?arrow_forward
- Describe what would happen to the lac operon in a low-lactose environment and in a high lactose environment. a) How will each of these environments affect gene expression? b) What would happen to the repressor in each case? c) How will each of these environments affect RNA polymerase?arrow_forwardWhat are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention about the role of repressor, activator, RNA polymerase in each case! A) Glucose is absent and lactose is present B) Glucose is present and lactose is present C) Glucose is present and lactose is absentarrow_forwardAccording to the operon model, for the synthesis of an inducible enzyme to occur, the end-product must not be in excess an inducer must bind to the enzyme an inducer must bind to the repressor repressor must bind to the operator repressor must not be synthesizedarrow_forward
- What is the phenotype of an E. coli strain with a mutation in the lac operator that allows the lac repressor to irreversibly bind the operator? Assume glucose is absent. 1S A) O Transcription of the operon is very high whether lactose is present or not. B) O Transcription of the operon is very low whether lactose is present or not. C) O Transcription of the operon is high in the presence of lactose, and low in its absence. D) O Transcription of the operon is low in the presence of lactose, and high in its absence.arrow_forwardWhich of the following statements is not true of both the LacI and TrpR repressor proteins?a) an allosteric effector molecule changes the DNA-binding activity of the proteinb) transcription is blocked when the repressor protein is bound to the operatorc) the repressor protein is trans-actingd) the allosteric effector causes the repressor to release from the operatore) the operon regulated by the repressor produces the allosteric effector moleculearrow_forwardThe transcription of many bacterial genes relies on functional groups called operons, such as the tryptophan operon. What is an operon?arrow_forward
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