a gene that's expression is turned off by a repressor which is inactive when it doesn't...
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a gene that's expression is turned off by a repressor which is inactive when it doesn't have its small effector molecule is :
inducible and under negative control
inducible and under positive control
repressible and under negative control
repressible and under positive control
QUESTION 2
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a gene that's expression is turned on by an activator which is inactive when it doesn't have its small effector molecule is :
inducible and under negative control
inducible and under positive control
repressible and under negative control
repressible and under positive control
Question 3
QUESTION 3
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a gene that's expression is turned off by a repressor which is active when it doesn't have its small effector molecule is :
inducible and under negative control
inducible and under positive control
repressible and under negative control
repressible and under positive control
0.5 points
QUESTION 4
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a gene that's expression is turned on by an activator which is active when it doesn't have its small effector molecule is :
inducible and under negative control
inducible and under positive control
repressible and under negative control
repressible and under positive control
Homework Answers
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a gene that's expression is turned off by a repressor which is
inactive when it doesn't...
Which of the following statements is correct concerning operon gene control? Positive control requires an activator...
Which of the following statements is correct concerning operon gene control? Positive control requires an activator protein to stimulate transcription of the structural genes within an operon. In negative control, a repressor protein inhibits or turns off transcription of the structural genes within the operon. An inducible operon normally is not transcribed. It requires an inducer molecule to stimulate transcription either by inactivating a repressor protein in a negative inducible operon or by stimulating the activator protein in a positive...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? ...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? 2. Illustrate it. Include: RNA repressors erase, repressors, and any other molecules needed to show how this worke. GENE TURNED ON -+ + +- Promoter OperatorStructural Genes 3. What happens to transcription at the trp operon when trypto 4. Illustrate it. Include: RNA polymerase, e, repressors and any other molecules needed to show the following GENE TURNED OFF Promoter Operator Structural Genes Circle...
QUESTION 8 The following situations (1-4) involve different types of gene regulation in prokaryotic cells as shown. OFF...
QUESTION 8 The following situations (1-4) involve different types of gene regulation in prokaryotic cells as shown. OFF and ON reter to whether the gene is transcribed or not. Draw clearly-labelled regulatory proteins and effector molecules in each diagram to explain how the regulation works in each case. The first one has been done for you as an example a) (6 marks) Type of Regulation Regulatory protein effector molecule 1 DNA X negative inducible OFF ON 2 negative repressible DNA...
here is the diagram ecause there is no repressor protein attached to the operator, what enzyme...
here is the diagram
ecause there is no repressor protein attached to the operator, what enzyme con attach to the promoter and move past the operator to transcribe the structural genes? Color this enzyme pink "color the repressor gene purple and the repressor protein it codes for red. Examine the shape of the repressor protein. 45) Is it an active or inactiverepressor protein? The diagram below shows the trp operon when turned off." Repressor gene Promoter Operator Structural genes DNA...
the answer I gave was wrong Which of the following statements about gene regulation concerning operons...
the answer I gave was wrong
Which of the following statements about gene regulation concerning operons is INCORRECT? A regulator gene has its own promoter and is transcribed into an independent mRNA. For an operon under negative repressible control, a correpressor is required for the repressor to bind to the operator. Presence of operons where genes of related functions are clustered is common in bacteria but not in eukaryotes. For a gene under positive repressible control, the normal state is...
A particular gene (call it xyz) is, like the lac operon, regulated both by Negative and...
A particular gene (call it xyz) is, like the lac operon, regulated both by Negative and by Positive control. However, unlike the lac operon, xyz's Negative control system is repressible. We'll call the repressor signal "signal 1." The Positive control system of xyz, like that of lac, is inducible. We'll call the inducer "signal 2." I want you to sketch the xyz gene in the presence and absence of each signal, as follows, and then determine whether the xyz gene...
1) The lac operon is… a) Positive repressible b) Both negative inducible and positive repressible c)...
1) The lac operon is… a) Positive repressible b) Both negative inducible and positive repressible c) Positive inducible d) Negative inducible 2) An activator regulatory protein… a) Is involved in negative regulatory control b) Is a cis acting regulatory element c) Recruits RNA polymerase to the promoter d) Prevents RNA polymerase from binding the promoter 3) For the lac operon, the presence of the substrate (lactose) activates the repressor. True or False? a) true b) false 4) cAMP… a) Activates...
Question 28: A system in which a regulatory protein binding to a co-regulatory molecule causes it...
Question 28: A system in which a regulatory protein binding to a co-regulatory molecule causes it to leave the operator, thereby inhibiting transcription of target genes, an example of: Group of answer choices a. Inducible negative control b. Repressible positive control c. Inducible positive control d. Repressible negative control Question 29: MEK, a MAP kinase kinase, is activated by phosphorylation. You create a mutant MEK in which the amino acids that are normally phosphorylated is replaced with aspartate. Predict the...
Match each term associated with genes and control of gene expression with the appropriate description. A...
Match each term associated with genes and control of gene expression with the appropriate description. A transcriptional unit" that consists of promoter multiple genes under the control of a single regulatory element. A transcriptional regulatory protein (prokaryotic or eukaryotic) which works by turning on or increasing gene transcription. activator The region of a gene to which RNA polymerase binds. Enhancer A transcriptional regulatory protein prokaryotic or eukaryotic) which works by turning off or decreasing gene transcription. repressor A molecule that...
Complete this quiz after watching the Gene regulation chapter 14 1 and 2 videos. We cover...
Complete this quiz after watching the Gene regulation chapter 14 1 and 2 videos. We cover only Lac operon. Question 2 1 pts Which statement best describes the lac operon in E.coli? o Constitutively expressed genes ( always "on") O Negative transcriptional control of inducible genes ( turned "off" until turned "on") O Positive transcriptional control of repressible genes ("on" until tuned "off") - Previous Next →
Which of the following statements is correct concerning operon gene control? Positive control requires an activator protein to stimulate transcription of the structural genes within an operon. In negative control, a repressor protein inhibits or turns off transcription of the structural genes within the operon. An inducible operon normally is not transcribed. It requires an inducer molecule to stimulate transcription either by inactivating a repressor protein in a negative inducible operon or by stimulating the activator protein in a positive...
P OPERON What happens to transcription at the trp operon when 1. tryptophan levels are low? Why? 2. Illustrate it. Include: RNA repressors erase, repressors, and any other molecules needed to show how this worke. GENE TURNED ON -+ + +- Promoter OperatorStructural Genes 3. What happens to transcription at the trp operon when trypto 4. Illustrate it. Include: RNA polymerase, e, repressors and any other molecules needed to show the following GENE TURNED OFF Promoter Operator Structural Genes Circle...
QUESTION 8 The following situations (1-4) involve different types of gene regulation in prokaryotic cells as shown. OFF and ON reter to whether the gene is transcribed or not. Draw clearly-labelled regulatory proteins and effector molecules in each diagram to explain how the regulation works in each case. The first one has been done for you as an example a) (6 marks) Type of Regulation Regulatory protein effector molecule 1 DNA X negative inducible OFF ON 2 negative repressible DNA...
here is the diagram
ecause there is no repressor protein attached to the operator, what enzyme con attach to the promoter and move past the operator to transcribe the structural genes? Color this enzyme pink "color the repressor gene purple and the repressor protein it codes for red. Examine the shape of the repressor protein. 45) Is it an active or inactiverepressor protein? The diagram below shows the trp operon when turned off." Repressor gene Promoter Operator Structural genes DNA...
the answer I gave was wrong
Which of the following statements about gene regulation concerning operons is INCORRECT? A regulator gene has its own promoter and is transcribed into an independent mRNA. For an operon under negative repressible control, a correpressor is required for the repressor to bind to the operator. Presence of operons where genes of related functions are clustered is common in bacteria but not in eukaryotes. For a gene under positive repressible control, the normal state is...
Match each term associated with genes and control of gene expression with the appropriate description. A transcriptional unit" that consists of promoter multiple genes under the control of a single regulatory element. A transcriptional regulatory protein (prokaryotic or eukaryotic) which works by turning on or increasing gene transcription. activator The region of a gene to which RNA polymerase binds. Enhancer A transcriptional regulatory protein prokaryotic or eukaryotic) which works by turning off or decreasing gene transcription. repressor A molecule that...
Complete this quiz after watching the Gene regulation chapter 14 1 and 2 videos. We cover only Lac operon. Question 2 1 pts Which statement best describes the lac operon in E.coli? o Constitutively expressed genes ( always "on") O Negative transcriptional control of inducible genes ( turned "off" until turned "on") O Positive transcriptional control of repressible genes ("on" until tuned "off") - Previous Next →
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