Which of the following molecules will experience a large change in cytoplasmic concentration when the above tryptophan operon is turned on (in E. coli cells)? A. tryptophan molecules will decrease in concentration B. lactose molecules will decrease in concentration C. tryptophan molecules will increase in concentration D. lactose molecules will increase in concentration E. none of the above

Which of the following molecules will experience a large change in cytoplasmic concentration when the above tryptophan operon is turned on (in E. coli cells)? A. tryptophan molecules will decrease in concentration B. lactose molecules will decrease in concentration C. tryptophan molecules will increase in concentration D. lactose molecules will increase in concentration E. none of the above

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 9TYU: A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous...

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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 transcription
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 above
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 enhancer
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.
Say you have an operon called the CAKE operon, it contains genes for the enzymes require to convert C into E via following steps C-->A-->K-->E. 1) if this operon is *inducible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the inducer molecule 2) if the operon is *repressible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the co-repressor molecule
Say you have an operon called the CAKE operon, it contains genes for the enzymes require to convert C into E via following steps C-->A-->K-->E. 1) if this operon is *inducible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on whcih is the inducer molecule 2) if the operon is *repressible*, the maximum level of the enzymes for A-->K is most likely made when there is: a) high level of C b) high level of E c) low level of C d) low level of E e) unpredictable - depends on which is the co-repressor molecule
Define the following in the context of operons: a. positive control b. give an example of an operon that is under positive control c. negative control d. 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 activator
Which of the following molecules is an inducer of the lac operon:a. Galactose d. Isothiocyanateb. Glucose e. cAMPc. Allolactose f. Lactose
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
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?
If 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.
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