17. Which of the following can turn a repressible operon on? A. An increase in concentration of the corepressor B. A decrease in concentration of the corepressor C. An increase in concentration of the active inducer D. An increase in concentration of the inactive inducer E. An increase in concentration of the active repressor

17. Which of the following can turn a repressible operon on? A. An increase in concentration of the corepressor B. A decrease in concentration of the corepressor C. An increase in concentration of the active inducer D. An increase in concentration of the inactive inducer E. An increase in concentration of the active repressor

Name: 17. Which of the following can turn a repressible operon on?A. An inc
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Description: 17. Which of the following can turn a repressible operon on?A. An increase in concentration of the corepressorB. A decrease in concentration of the corepressorC. An increase in concentration of the active inducerD. An increase in concentration of th

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 7TYU: Which of the following is characteristic of genes and gene regulation in both bacteria and...

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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
Which of the following is characteristic of genes and gene regulation in both bacteria and eukaryotes? (a) promoters (b) non-coding DNA within coding sequences (c) enhancers (d) operons (e) DNA located in a nucleus
Binding of _______ to _______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors c. repressors; operators b. activators; enhancers d. repressors; enhancers
. In the tryptophan operon of E. coli, what happens when tryptophan levels get too high? tryptophan is removed from its co-repressor, causing it to detach from the operator tryptophan is removed from its co-repressor, causing it to attach to the operator tryptophan is bound to its co-repressor, causing it to detach from the operator tryptophan is bound to its co-repressor, causing it to attach to the operator all of the above occur at equal rates when tryptophan levels get too high
If a particular operon encodes enzymes for making an essential amino acid is regulated like the trp operon, then: O the amino acid activates the repressor O the amino acid turns off transcription of the regulatory gene O the amino acid turns on transcription of the operon O the repressor is active in the absence of the amino acid
1. (a) Tryptophan-repressor complex binds to operator Gene is switched ON Gene is switched OFF Does NOT affect the gene expression (b) Operator is not bound with the repressor Gene is switched ON Gene is switched OFF Does NOT affect the gene expression
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 activator
In the absence of lactose, the genes of the lac operon are: Not transcribed; because there is no lactose to activate the polymerase Not transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to inhibit the repressor Transcribed; because there is no lactose to activate the repressor
A new operon called Terperon is discovered and is not normally transcribed. It is stimulated by the regulatory protein Rutgease. What kind of control is Terperon exhibiting? Group of answer choices Positive repressible Positive inducible Negative repressible Negative inducible
All of the following statements about the repressor of the lac operon of E. coli are true EXCEPT which one? O A. The repressor is the product of a regulatory gene i The repressor binds to the operator region of the DNA of the lac OB. operon. The repressor is a protein. OC. The repressor interacts with the operator in such a way as to OD. prevent translation of beta-galactosidase. The repressor can combine with lactose to form a OE. complex that will no longer bind to the operator region. QUESTION 32 The amino acid which is a precursor of serotonin is Histidine OA. O B. Tyrosine O C. Glutamate D. Tryptophan O E. none of the above
1. The lactose operon is controlled by both lactose and glucose. Fill in the following table to indicate what would be occurring under different cellular conditions Lactose absent present absent present Glucose Operon Activity (high/low) absent absent present present low high 10W high CAMP Repressor (bound/free) (high/low) bound free buind will high high low CAP (bound/free) bound free full
Lac operon regulation under allolactose functions under____________ control; trp operon regulation under tryptophan functions under____________ control. Group of answer choices negative inducible; negative repressible positive inducible; negative repressible positive inducible; positive repressible negative repressible; negative inducible negative inducible; positive repressible