A mutation at the operator site of a positive inducible operon that causes the sequence of the operator to change, would result in: Group of answer choices Activator unable to bind to DNA, transcription turned on Activator binds to DNA, transcription turned off Activator binds to DNA, transcription turned on Activator unable to bind to DNA, transcription turned off

A mutation at the operator site of a positive inducible operon that causes the sequence of the operator to change, would result in: Group of answer choices Activator unable to bind to DNA, transcription turned on Activator binds to DNA, transcription turned off Activator binds to DNA, transcription turned on Activator unable to bind to DNA, transcription turned off

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
For an enzyme to be produced from an inducible operon, the repressor must bind to and digest the substrate. the substrate must bind to the repressor and remove it from the operator. the substrate must bind to the operator. the repressor must be bound to the operator.
In the lac operon system, lactose is considered the ___________, and when the gene lacI is mutated such that the protein it produces cannot bind to lactose (IS mutation), the lac operon is ________. Group of answer choices repressor; never expressed activator; constitutively expressed inducer; never expressed inducer; constitutively expressed structural gene; never expressed
If an operon is controlled by an activator and the substrate of the metabolic pathway then the type of regulation is positive inducible. negative repressible. positive repressible. negative inducible.
According to the operon model, for the synthesis of an inducible enzyme to occur, the end-product must not be in excess an inducer must bind to the enzyme an inducer must bind to the repressor repressor must bind to the operator repressor must not be synthesized
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
A transcription repressor results in a decrease in transcription of an operon. This is an example of ____________________________. a constitutive system an inducible system positive control negative control a repressible system
A mutation at the operator prevents the regulator protein from binding.What effect will this mutation have in the following types of operons? Q. Regulator protein is a repressor of a repressible operon.
The regulation of the lac operon in E. coli by Catabolite Activator Protein and glucose is an example of what type of regulation? Group of answer choices Positive inducible Positive repressible Negative inducible Negative repressible Constitutive
What type of mutation in an operon is most likely to affect the synthesis of more than one protein?
In the presence of lactose and the promoter sequence was mutated such that the RNA polymerase can no longer bind, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the absence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"]
The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented.