BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 16, Problem 2S
Examples of positive and negative control of transcription can be found in the regulation of expression of the bacterial operons lac and trp. Use these two operon systems to describe the difference between positive and negative regulation.
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In the lac operon system, do the inducers act at the transcription or translation level? Explain why it acts in that level in a short but concise way.
Describe how the components of the trp operon system are affected by a mutation in trpC?
Why is it that once enviornmental tryptophan is inserted into the cell, only the trp repressor is activated (turned on)?
The Lac operon is a common example of prokaryotic control of gene expression. In what condition is it turned on?
Chapter 16 Solutions
BIOLOGY
Ch. 16.1 - Prob. 1LOCh. 16.1 - Prob. 2LOCh. 16.1 - Prob. 3LOCh. 16.2 - Explain how proteins can interact with base-pairs...Ch. 16.2 - Prob. 2LOCh. 16.3 - Prob. 1LOCh. 16.3 - Prob. 2LOCh. 16.3 - Explain control of gene expression in the trp...Ch. 16.4 - Prob. 1LOCh. 16.4 - Prob. 2LO
Ch. 16.4 - Prob. 3LOCh. 16.5 - Describe at least two kinds of epigenetic mark.Ch. 16.5 - Explain the function of chromatin-remodeling...Ch. 16.6 - Prob. 1LOCh. 16.6 - Prob. 2LOCh. 16.7 - Prob. 1LOCh. 16.7 - Prob. 2LOCh. 16 - Prob. 1DACh. 16 - What advantage might a bacterium gain by linking...Ch. 16 - Prob. 2IQCh. 16 - Prob. 3IQCh. 16 - In prokaryotes, control of gene expression usually...Ch. 16 - Prob. 2UCh. 16 - Prob. 3UCh. 16 - The lac operon is controlled by two main proteins....Ch. 16 - In eukaryotes, binding of RNA polymerase to a...Ch. 16 - In eukaryotes, the regulation of gene expression...Ch. 16 - In the trp operon, the repressor binds to DNA a....Ch. 16 - Prob. 1ACh. 16 - Specific transcription factors in eukaryotes...Ch. 16 - Repression in the trp operon and induction in the...Ch. 16 - Regulation by small RNAs and alternative splicing...Ch. 16 - Eukaryotic mRNAs differ from prokaryotic mRNAs in...Ch. 16 - In the cell cycle, cyclin proteins are produced in...Ch. 16 - A mechanism of control in E. coli not discussed in...Ch. 16 - You have isolated a series of mutants affecting...Ch. 16 - Examples of positive and negative control of...Ch. 16 - What forms of eukaryotic control of gene...Ch. 16 - The number and type of proteins found in a cell...
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- Explain why inactivation of the O1 sequence of the lac operator almost completely abolishes repression of the lac operon.arrow_forwardTrue or false: The lac operon is regulated by the binding of an enhancer to sequences just upstream of the promoterarrow_forwardWhen cAMP binds to the Catabolite Activator Protein (CAP), it causes a conformational change on the protein, which results in binding to the CAP-binding site on the DNA and ___________________________ of the lac operon. This conformational change induced by the binding of another molecule is known as a(n) _________________________________. transcription repression; binding effect translation; distortion effect mutation; interactive effect attenuation; compression effect transcription activation; allosteric effectarrow_forward
- Regarding the tryptophan operon in bacteria, in the presence of tryptophan, tryptophan binds to the Group of answer choices Operon Operator Repressor Promoter RNA polymerasearrow_forwardThe transcription of many bacterial genes relies on functional groups called operons, such as the tryptophan operon. What is an operon?arrow_forwardThere is a mutation in sequence of the lac operator that prevents the lac repressor from being able to recognize and bind to it. What would the status of transcription of the lac operon be under each of the following circumstances? Explain your answers. a-Lactose present, glucose present b-Lactose present, glucose absent c-Lactose absent, glucose present d-Lactose absent, glucose absentarrow_forward
- Under what conditions would you expect to see high levels of expression of the structural genes in the lac operon? Group of answer choices Lactose is absent and glucose is absent Lactose is absent and glucose is present Lactose is present and glucose is present None of these Lactose is present and glucose is absentarrow_forwardA mutation prevents the catabolite activator protein (CAP) from binding to the promoter in the lac operon. What will the effect of this mutation be on the transcription of the operon?arrow_forwardIf the two trp codons in the leader sequence were mutated to stop codons, what effect would it have on gene expression of that operon.arrow_forward
- When referring to attenuation in the regulation of the trp operon it would be safe to say that, when there are high levels of tryptophan available to the organism, ________. tryptophan inactivates the repressor protein translation termination of the trp operon is likely the trp operon is transcribed at relatively high levels the ribosomes stall during translation of the attenuator region transcription termination at the attenuator region is likelyarrow_forwardDescribe two examples of regulators that acted on transcription at steps after initiation. Of the two examples, one must be from a phage system and the other from a bacterial biosynthetic operon.arrow_forwardExplain why large amounts of transcript result when a bacterium with a lac Operon is in a medium with no glucose and an abundance of lactose.arrow_forward
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