BROOKER BIOLOGY
5th Edition
ISBN: 9781307656152
Author: BROOKER
Publisher: MCG/CREATE
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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
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
BROOKER 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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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
- Which 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_forwardWhich 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_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
- In the trp operon, tryptophan is best characterized as being a: A. repressor B. inducer C. corepressor D. DNA-binding domainarrow_forwardIf 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_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
- When 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_forwardF’ lac I- O+ Z+/ lac I+ Oc Z- the genotype indicated would lead to what type of expression of β‐galactosidase with respect to lactose inducibility of the lac operon. A. Constitutive B. Cannot be determined C. Inducible D. Uninduciblearrow_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
- For transcription of middle promoters in T4 phage, the anti-sigma factor, AsiA, will а. bind -10 region of middle promoters O b. bind -30 region of middle promoters O c. modify sigma factor of E. coli RNA polymerase via ADP- ribosylation. d. bind sigma factor of E. coli RNA polymerasearrow_forwardFor a lac operon of genotype l'POʻ*, functional beta-galactosidase is ... (pick the best answer) Select one: O a. Never produced O b. Constitutively produced O c. Under inducible controlarrow_forwardhe bands indicated by arrow "A" (to the left of the western blot) most likely represent: A. PX-HA lacking any post-translational modifications. B. dephosphorylated PX-HA. C. phosphorylated PX-HA. D. PX-HA with its N-terminal signal sequence still attached. E. glycosylated PX-HA.arrow_forward
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