BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
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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Check out a sample textbook solutionStudents have asked these similar questions
In order for the lac operon to be triggered, lactose must be present and ________.
a.
cAMP levels low
b.
glucose stores depleted
c.
glucose levels high
in E.coli, high glucose levels reduce cyclic AMP (cAMP) levels which then ______ transcription of the lactose operon.
a.
does NOT change
b.
decreases
c.
increases
Match the key complex or product to its related process of regulating gene expression.
a. Constitutive genes
b. Operons
c. The lac operon
d. An operator
e. A repressor
f. The trp operon
g. Tryptophan
h. A promoter
65. is induced by the presence of lactose in the environment.
66. is a repressed by the presence of tryptophan in the environment.
67. are regions of clustered genes under the control of one promoter.
Chapter 14 Solutions
BIOLOGY (LL)
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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- b. c. spores d. all of the above e. none of the above 4. Concerning the lac operon, activation of the protein called CAP by CAMP will enable the complex CAP-CAMP to bind to the a. promoter b. terminator c. activator-binding site d. operator e. coding sequence 5. Bacteria are excellent model organisms for genetic studies, and mutations often result in observable phenotypic changes because a. of their rapid growth b. they are haploid organisms c. they can be studied in relatively inexpensive experiments d. they have a diploid genome e. their phenotypic changes can also be affected by environmental factorsarrow_forwardWhich of these BEST DESCRIBE tryptophan in the Trp Operon? A. Acts as a corepressor B. Acts as a coactivator C. Acts as an inducer D. Acts as an enhancerarrow_forwardThe RNA-induced silencing complex (RISC) _____i. Binds to and unwinds ds siRNA/miRNA to produce ss siRNAs/miRNAii. Creates a block and inhibits translation when the ss siRNA matches the mRNAiii. Mediates the degradation of the siRNA or miRNA to repress gene expression a. I onlyb. II onlyc. I and IId. II and IIIarrow_forward
- Which of the following molecules will experience a large change in cytoplasmic concentration whenthe above tryptophan operon is turned on (in E. coli cells)?A. tryptophan molecules will decrease in concentrationB. lactose molecules will decrease in concentrationC. tryptophan molecules will increase in concentrationD. lactose molecules will increase in concentrationE. none of the abovearrow_forwardIf glucose is absent, but lactose is available, the lac operon will be _______ A. activated B. repressed C. activated, but only partially D. mutatedarrow_forwardIn the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainarrow_forward
- If tryptophan is presence in the culture media of E.coli then _________. the promoter will be accessed by the RNA polymerase the repressor will bind to the operator the structural genes of the trp operon will be expressed tryptophan will be synthesizedarrow_forwardIn regulations demonstrated by initiation of transcription, if lactose is abundant, lactose in this operon system is termed a. inducer b. coactivator C. corepressor d. operator e. repressor O a. a O b. b Vindows bo c.c O d. darrow_forwardRead the following statements about operons, and mark the FALSE one. O a. Prokaryotes use operons frequently because they are an efficient use of resources O b. The expression levels of the genes in an operon can be regulated individually Genes in an operon are placed next to each other (physically) O d. The genes in an operon share a single promoterarrow_forward
- An operon is repressible—a small effector molecule turns off itstranscription. Which combination(s) of small effector molecule andregulatory protein could be involved in this process?A. An inducer plus a repressorB. A corepressor plus a repressorC. An inhibitor plus an activatorD. An inducer plus an activatorarrow_forwardIn the ara operon in E. coli cells, AraC will bind to its specific target DNA when_ O a. when there is no glucose in cells. O b. it does not bind arabinose O c. it binds arabinose O d. it binds allolactose.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
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