Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 18, Problem 2TYK
Summary Introduction
Introduction:
The gene expression and the changes undergone enable a bacterial cell to positively respond to the changes in the environment. Gene products are produced or activated only when required for an associated biological functioning of product. The gene expression is controlled at three stages, namely, the transcription, translation, and the post-transcription.
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In the trp operon, what happens to the trp repressor in the absence of tryptophan?
a. It binds to the operator and represses transcription.
b. It cannot bind to the operator, and transcription takes place.
c. It binds to the regulator gene and represses transcription.
d. It cannot bind to the regulator gene, and transcription takes place.
In the lac operon, the lac genes are transcribed in the presence of lactose because
a
RNA polymerase binds to the operator
b
The repressor can not bind the promoter
c
Production of the repressor protein is inducible
d
The inducer binds to the repressor
e
The inducer binds to the operator
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?
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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
- A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcriptionarrow_forwardWhich of the following statements about gene regulation is false? a. An operon contains DNA sequences that regulates its own expression. b. The operator region can only be bound by an activator protein. c. Transcription factors can affect the binding of RNA polymerase to the promoter. d. A repressor is a transcription factor that hinders gene transcription.arrow_forwardd. give an example of an operon that is under negative control e. repressor f. give an example of a repressor molecule g. activator h. give an example of an activatorarrow_forward
- The regulator protein that acts on a negative repressible operon is synthesized as a. an active activator. c. an active repressor. b. an inactive activator. d. an inactive repressor.arrow_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_forwardWhat is an operon ? a. A series of genes controlled by the same operator b. A series of genes on the same mRNA molecule c. A series of genes that all have the same function d. A series of genes all regulated by the same repressorarrow_forward
- Which of the following is true of transcription factors? A)The same transcription factors are found in all cell types. B)They can increase or decrease gene expression. C)They are a type of cis-acting element. D)They bind only to promoters.arrow_forwardWhat is the role of a substrate that controls a repressible operon? a. increase the production of inactive repressor proteins b. bind to the repressor protein and activate it c. bind to the repressor protein and deactivate it d. bind to the promoter region and decrease the affinity of RNA polymerase for the promoterarrow_forwardWhich will be bound to the Lac Operon in an environment with lactose and glucose? A) both repressor and CAP B) repressor only C) CAP only D) neither repressor nor CAParrow_forward
- 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_forwardCan one transcription factor sometimes act as a repressor and sometimes act as an activator? a. Yes, but it depends on where the transcription factor binds in the promoter b. Yes, but it depends on other proteins that might act with the transcription factor c. No, transcription factors are always either activators or repressors d. Yes, but only if a mutation happensarrow_forwardWhat 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 genesarrow_forward
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