Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 14, Problem 7TY
The trp operon is considered _____ blank operon because the protein-encoding genes necessary for tryptophan synthesis are not expressed when the level of tryptophan in the cell is high.
- a. an inducible
- b. a positive
- c. a repressive
- d. a negative
- e. both c and d
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Students have asked these similar questions
The gad operon is controlled by a number of transcription factors that regulate a promoter of approximately 450bp. Which would NOT explain why bacterial promoters are shorter than the typical eukaryotic promoter?
a. Bacteria do not have nucleosomes
b. Bacteria do not have mediator complex
c. Each operon is regulated by only one signal
d. All of the above are true
If glucose is absent, but lactose is available, the lac operon will be _______
A. activated
B. repressed
C. activated, but only partially
D. mutated
If tryptophan is absent from the environment of E.coli, the trp operon will be _______
A) mutated
B) activated, but only partially
C) activated
D) repressed
Chapter 14 Solutions
Biology
Ch. 14.1 - Prob. 1CCCh. 14.2 - Which genes are under the control of the lac...Ch. 14.2 - With regard to regulatory proteins and small...Ch. 14.2 - What were the key observations made by Jacob,...Ch. 14.2 - CoreSKILL What was the eventual hypothesis...Ch. 14.2 - Prob. 3EQCh. 14.2 - Core Skill: Connections Look back at Fig 9.12....Ch. 14.2 - What are the advantages of having both an...Ch. 14.2 - Prob. 2CSCh. 14.3 - Prob. 1CC
Ch. 14.4 - What are the two opposing effects that histone...Ch. 14.4 - Prob. 1CSCh. 14.5 - Prob. 1CCCh. 14.5 - Prob. 2CCCh. 14 - Prob. 1TYCh. 14 - Prob. 2TYCh. 14 - Transcription factors that bind to DNA and...Ch. 14 - Prob. 4TYCh. 14 - For the lac operon, what would be the expected...Ch. 14 - Prob. 6TYCh. 14 - The trp operon is considered _____ blank operon...Ch. 14 - Prob. 8TYCh. 14 - Prob. 9TYCh. 14 - _____ blank refers to the process that allows a...Ch. 14 - Prob. 1CQCh. 14 - Transcriptional regulation often involves a...Ch. 14 - Prob. 3CQCh. 14 - Discuss the advantages and disadvantages of...Ch. 14 - Discuss the advantages and disadvantages of...
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- 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_forwardIn a bacterial operon, the active repressor bind to the A. promoter. B. terminator. C. operator. D. regulator.arrow_forwardThe tryptophan operon is a repressible operon that is A. transcribed only when glucose is present in the growth medium B. not transcribed whenever tryptophan is plentiful in the growth medium C. permanently turned on D. turned on only when tryptophan is present in the growth mediumarrow_forward
- Tryptophan (Trp) attenuation is an extra mechanism of regulation of trp operon when trp level is too high. Attenuation causes premature transcription termination. b) Predict what will happen if trp repressor lose its allosteric effect.arrow_forwardplease answer Why is it useful to have two different mechanisms of positive regulation? I.e. why would cells have both AraC and CAP-cAMP as activators in the Arbinose operon.arrow_forwardWhy do eukaryotic cells not have a lac operon? A. Eukaryotic cells cannot transcribe multiple genes under one promoter B. Eukaryotic cells dont have repressors C. They can always metabolize lactosearrow_forward
- A mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator site. The effect that this mutation has on the cell is that a. the activity of the lac operon will not be affected. b. the cell can no longer convert lactose to glucose. c. the expression of the lac genes cannot be turned off. d. the expression of the lac genes cannot be turned on.arrow_forwardWhen tryptophan levels in the cell are low A the trp repressor will be bound and the operon transcribed B the trp repressor will not be bound and the operon transcribed C the trp repressor will not be bound and the operon not transcribed D none of the abovearrow_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
- You are growing E. coli in a laboratory in order to study their operons. The growth media you are using contains lactose, no glucose and no tryptophan. Using your knowledge of operons and their regulation a.Which operons would be functional under these conditions? b.What repressors would be made? (NOTE: name the repressors using their gene names) c.Which repressor(s) would be made in the inactive form? d.Which repressor(s) would be made in the active form? e.Which repressor(s) under these conditions can bind the operator sequence? f.Which repressor(s)under these conditions cannot bind the operator sequence?arrow_forwardThe effect that allolactose has on LacI is a. causing it to block binding of the CAP protein. b. causing it to change shape so that it cannot bind to DNA. c. causing it to not be expressed anymore. d. causing it to help RNA polymerase to bind.arrow_forwardIf lactose and glucose are provided in the growth medium of a culture of E. coli, then a. Both lactose and glucose are metabolized at same rate. b. Lactose metabolism is favored. c. CAMP-CAP complex binds CAP site. d. Lac Operon is repressed. e. Adenylate cyclase is activated.arrow_forward
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