Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 14, Problem 2TYU
Summary Introduction
Introduction: Operons are a set of genes containing a promoter and one or more operators that helps to control the transcription process. Each operon is made of structural genes, promoter and operator. Inducible operons are turned on by the presence of the substrate. Lac operon is an inducible operon.
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What would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genes
1. (a)
Binding of inducer protein to repressor protein
Gene is switched ON
Gene is switched OFF
Does NOT affect the gene expression
(b)
Repressor protein binding at DNA upstream
Gene is switched ON
Gene is switched OFF
Does NOT affect the gene expression
(c)
Operator is not bound with the repressor
Gene is switched ON
Gene is switched OFF
Does NOT affect the gene expression
The regulation of the trp operon genes by the Trp repressor protein is an example of ______ gene regulation.
A.)positive
B.)negative
Chapter 14 Solutions
Biology (MindTap Course List)
Ch. 14.1 - Explain why bacterial and eukaryotic cells have...Ch. 14.1 - Prob. 1CCh. 14.1 - Prob. 2CCh. 14.2 - Prob. 2LOCh. 14.2 - Distinguish among inducible, repressible, and...Ch. 14.2 - Differentiate between positive and negative...Ch. 14.2 - Prob. 5LOCh. 14.2 - Prob. 1CCh. 14.2 - What structural features does the trp operon share...Ch. 14.2 - Prob. 3C
Ch. 14.2 - Prob. 4CCh. 14.3 - Prob. 6LOCh. 14.3 - Give examples of some of the ways eukaryotic...Ch. 14.3 - Prob. 8LOCh. 14.3 - Prob. 9LOCh. 14.3 - Prob. 10LOCh. 14.3 - Prob. 1CCh. 14.3 - Prob. 2CCh. 14.3 - Prob. 3CCh. 14.3 - Prob. 4CCh. 14.3 - Prob. 5CCh. 14 - The regulation of most bacterial genes occurs at...Ch. 14 - Prob. 2TYUCh. 14 - Prob. 3TYUCh. 14 - Prob. 4TYUCh. 14 - Inactive genes tend to be found in (a) highly...Ch. 14 - Prob. 6TYUCh. 14 - Which of the following is characteristic of genes...Ch. 14 - Through alternative splicing, eukaryotes (a)...Ch. 14 - A mutation that inactivates the repressor gene of...Ch. 14 - Which of the following is an example of positive...Ch. 14 - Prob. 11TYUCh. 14 - PREDICT Compare the types of bacterial genes...Ch. 14 - INTERPRET DATA Develop a simple hypothesis that...Ch. 14 - Prob. 14TYUCh. 14 - Prob. 15TYUCh. 14 - EVOLUTION LINK Suggest why evolution resulted in...Ch. 14 - Prob. 17TYU
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- In the trp operon, if a mutation occurred in the gene for the repressor so that it could bind to the operator even in the absence of tryptophan____________. a) the inducer cannot bind trpO, so operon gene transcription occurs b) the active repressor cannot bind trpO, so operon gene transcription is attenuated c)the active repressor binds tpO, so operon gene transcription is always repressed d) the repressor binds the corepressor, and operon gene transcription occurs.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 lactose operon is likely to be transcribed when _____. A) there is more glucose in the cell than lactose B) there is glucose but no lactose in the cell C) the cAMP level is high and the lactose level is low D) the cyclic AMP and lactose levels are both high within the cellarrow_forward
- . If a particular operon encodes enzymes for makingan essential amino acid and is regulated like thetrp operon, then(A) the amino acid inactivates the repressor.(B) the repressor is active in the absence of theamino acid.(C) the amino acid acts as a corepressor.(D) the amino acid turns on transcription of the operonarrow_forwardThe absence of tryptophan (trp) in E. coli A) O produces an inactive trp repressor B) O causes tryptophan to act as an inducer of transcription of the trp operon C) O prevents transcription of the trp structural genes D) O none of the abovearrow_forwardWhich of the following is an example of positive control? (a) transcription occurs when a repressor binds to an inducer (b) transcription cannot occur when a repressor binds to a corepressor (c) transcription is stimulated when an activator protein binds to DNA (d) a and b (e) a and carrow_forward
- The lac operon has which of the following characteristics? O 1) usually requires an activator protein bound to the promoter to be transcribed. O 2) is inactive in the presence of lactose. O 3) is active in the presence of a repressor. O 4) Is a constitutively active operator. O5) is only active in the presence of lactose.arrow_forward7) The tryptophan operator a) is an allosteric protein. b) binds to the tryptophan repressor when the repressor is bound to tryptophan. c) is required for production of the mRNA encoded by the tryptophan operon. d) is important for the production of the tryptophan repressor. Page 2 of 6arrow_forwardIf β-galactosidase is expressed when lactose is absent, what does this suggest about the lac operon? a) There is a mutation in the repressor protein b) There is a mutation in the catabolite activator protein c) There is a mutation in the promoter region d) There is a mutation in the luxI proteinarrow_forward
- Metabolic control is crucial part of survival for all bacteria. The lactose operon is located on the bacteria chromosome and assists in maintaining homeostasis. (a) Describe how an operon regulates the expression of genes. (b) Feedback plays an important part in life helping to maintain homeostasis. Explain how both negative and positive feedback help maintain homeostasisarrow_forwardThe DNA sequence before the protein coding region that determines when a gene is used is called the A regulatory protein that binds DNA to determine whether or not a gene is transcribed is called a Two proteins that make up part of the bacterial flagellum are jointly regulated and transcribed together in a(n) A operon is normally transcribed unless it is blocked by a repressor. A(n) operon is normally blocked by a repressor, until it is removed to allow transcription.arrow_forward1. (a) Tryptophan-repressor complex binds to operator Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) Operator is not bound with the repressor Gene is switched ON Gene is switched OFF Does NOT affect the gene expressionarrow_forward
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