PEARSON Campbell Biology Concepts and Connections Second Custom Edition for Austin Community College
2nd Edition
ISBN: 9781269918084
Author: Jane B. Reece, Martha R. Taylor, Jean L. Dickey, and Kelly Hogan Eric J. Simon
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 1TYU
If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then
- (A) the amino acid inactivates the repressor.
- (B) the repressor is active in the absence of the amino acid.
- (C) the amino acid acts as a corepressor.
| PRACTICI TEST QonqKuroi |
- (D) the amino acid turns on transcription of the operon.
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Students have asked these similar questions
If glucose levels in the cell are high and lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?
Given the Table below concerning the lac operon, match the letter with what would be occurring for each scenario.
Repressor is bound to the operator, cAMP complex is bound and transcription is prevented.
Allolactose is bound to the repressor, cAMP complex is bound, and transcription is prevalent.
Allolactose is bound to the repressor, cAMP complex is not assembled, and transcription is slow
Repressor is bound to the operator, cAMP complex is not assembled, and transcription is prevented.
If glucose is not available, but lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?
Chapter 18 Solutions
PEARSON Campbell Biology Concepts and Connections Second Custom Edition for Austin Community College
Ch. 18.1 - How does binding of the trp corepressor to the trp...Ch. 18.1 - Describe the binding of RNA Polymerase,...Ch. 18.1 - WHAT IF? A certain mutation in E. coli changes...Ch. 18.2 - In general, what are the effects of histone...Ch. 18.2 - Compare the roles of general and specific...Ch. 18.2 - WHAT IF? Suppose you compared the nucleotide...Ch. 18.2 - Once mRNA encoding a particular protein reaches...Ch. 18.3 - Compare miRNAs and siRNAs, including their...Ch. 18.3 - WH AT IF? Suppose the mRNA being degraded in...Ch. 18.4 - MAKE CONNECTIONS As you learned in Chapter 12,...
Ch. 18.4 - MAKE CONNECTIONS Explain how the signaling...Ch. 18.4 - How do fruit fly maternal effect genes determine...Ch. 18.4 - Prob. 4CCCh. 18.5 - MAKE CONNECTIONS The p53 protein can activate...Ch. 18.5 - Under what circumstances is cancer considered to...Ch. 18.5 - Prob. 3CCCh. 18 - Compare and contrast the roles of a corepressor...Ch. 18 - Describe what must happen in a cell for a gene...Ch. 18 - Why are miRNAs called noncoding RNAs? Explsin how...Ch. 18 - Describe the two main processes that cause...Ch. 18 - Compare the usual functions of proteins encoded by...Ch. 18 - If a particular operon encodes enzymes for making...Ch. 18 - Muscle cells differ from nerve cells mainly...Ch. 18 - The functioning of enhancers is an example of (A)...Ch. 18 - Cell differentiation always involves (A)...Ch. 18 - Which of the following is an example of...Ch. 18 - What would occur if the repressor of an inducible...Ch. 18 - Absence of bicoid in mRNA from a Drosophila egg...Ch. 18 - Which of the following statements about the DNA in...Ch. 18 - Within a cell, the amount of protein made using a...Ch. 18 - Prob. 10TYUCh. 18 - Prob. 11TYUCh. 18 - Prob. 12TYUCh. 18 - Prob. 13TYUCh. 18 - Prob. 14TYUCh. 18 - WRITE ABOUT A THEME: INTERACTIONS In a Short essay...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE The flashlight fish has...
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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
- The lac operon produces enzymes that allow the bacteria E. coli to metabolize lactose, it is in an inducable operon. When lactose is present, will the repressor protein attach or leave the operon? How would this effect the production of lactose producing enzymes?arrow_forwardA mutation occurs in the 5′ UTR of the trp operon that reduces the ability of region 2 to pair with region 3. What will the effect of this mutation be when the tryptophan level is high? When the tryptophan level is low?arrow_forwardIn the lac operon (above), what happens when glucose levels are low, but lactose levels increase? the repressor protein is detached from the operator, and transcription is not initiated the repressor protein is attached to the operator, and transcription is not initiated the repressor protein is detached from the operator, and transcription is initiated the repressor protein is attached to the operator, and transcription is initiated. Check all of the above occur at equal rates when glucose levels are low but lactose levels are higharrow_forward
- How does the lac operon regulate lactose digestion in bacteria?a. The repressor protein becomes a lactose-digesting enzyme onlywhen lactose is present.b. The repressor protein binds to the lac operon when lactose ispresent, blocking transcription.c. When lactose is present, it binds to the operator region of the lacoperon, activating transcription of the repressor protein gene.d. The repressor protein falls off the lac operon when lactose ispresent, and lactose-digesting genes are expressed.arrow_forward1. a) If glucose is not available and lactose is absent from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon? b)If glucose is not available, but lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon? b)arrow_forwardWhy is step 2 correct, is it because this is a repressible operon?arrow_forward
- 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)?arrow_forwardIf a motor nueron were to stimulate at mid point, what would the impulse do?arrow_forwardHow would each manipulation of the leader region of the trp mRNA affect transcription of the E. coli trp operon? 1. Increasing the distance (number of bases) between the leader peptide gene and sequence 2 would ___________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 2. Increasing the distance between sequences 2 and 3 would ____________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 3. Removing sequence 4 would ________________ transcriptional attenuation of the trp operon. (cause/not change/prevent) 4. Changing the two Trp codons in the leader peptide gene to His codons would cause transcriptional attenuation of the trp operon to ____________________. (lose its sensitivity to histidine/increase its sensitivity to tryptophan/lose its sensitivity to tryptophan) 5. Eliminating the ribosome‑binding site for the gene that encodes the leader peptide would cause transcriptional attenuation of the trp operon to…arrow_forward
- The lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) IS O+ Z+ IS OC Z+arrow_forwardThe lac operon of E. coli controls the expression of genes that code for enzymes involved in lactose metabolism. Mutations to various regions of the lac operon have been discovered which affect both the control of gene expression and the function of the gene products. These mutations include: I - = produces a repressor protein that cannot bind to the operator region IS = produces a repressor protein that cannot be removed from the operator region OC = cannot bind a repressor protein Z - = produces a defective (non-functioning) β-galactosidase enzyme + = wild type Detail the functionality of the lac operon under the following genetic and cellular conditions. You do not need to consider the role of CAP in your analysis. Genes Repressed (yes/no) Constitutive (yes/no) I+ OC Z+ I+ O+ Z+ (Lactose present) I- O+ Z+arrow_forwardWhat is an operon? Describe the functions of regulators, promoters,and operators.arrow_forward
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