1:What is the main difference between an activator protein and an inducer? 2:Give two lines of...
1:What is the main difference between an activator protein and an inducer?
2:Give two lines of evidence that indicate the lac operon is inducible. (2 pts)
3: What advantage does diauxic growth present for a bacterium?
Homework Answers
Quistion-1,inducer regulate gene expression and it can bind on both activator as well as repressor and can on or off transcription of gene.
Activator protein is a protein which on binding with their sequence increase transcription of gene .
Quistion-2,lac operon generally remain off and become turn on in presence of inducer (allolactose) and off in absence of it. So it is inducible as it requires inducer.
Quistion-3,diauxic growth means 1st in presence of glucose and 2nd in absence of glucose by using lactose.So glucose is preferred over lactose but when all glucose is used up,lactose is used.
Add Answer to:
1:What is the main difference between an activator protein and
an inducer?
2:Give two lines of...
1. Describe how bacteria regulate genes through operons. 2. What is the difference between a repressible...
1. Describe how bacteria regulate genes through operons. 2. What is the difference between a repressible and inducible genetic system? 3. Expression of the Lac operon is under the controls of (1) the Lacl repressor and (2) CAP. Consider each of the following conditions and determine which factors will be acting on the operon. Predict the rate of gene expression. Conditions Lac Operon fon" or "off" CAP present" or "absent" at Lac Operon Predict the rate of gene expression (none,...
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...
9. Using the diagram of the lac operon (regulates transcription of genes for lactose metabolizing enzymes)...
9. Using the diagram of the lac operon (regulates transcription of genes for lactose metabolizing enzymes) below, draw the appropriate positions for RNA polymerase and the CAP activator molecule when CAMP is present. Then draw the appropriate position for the repressor molecule when lactose is present as an inducer. Finally, indicate whether or not transcription occurs. (8 pts) Promoter Operator Gene 1 Gene 2 Gene 3
Question 12 2 pts What is the role of CAMP in regulation of the lactose operon?...
Question 12 2 pts What is the role of CAMP in regulation of the lactose operon? CAMP is a repressor of the lactose operon and turns off gene expression of the lactose operon CAMP is an activator and prevents the repressor protein from binding to the operator region of the operon which allows for the lactose operon to be turned "on". 5 CAMP is an inducer of the lactose operon and also an activator since it prevents the repressor protein...
1. (1 pt) If a gene is repressible and under positive control, A. Is the regulatory...
1. (1 pt) If a gene is repressible and under positive control, A. Is the regulatory protein an activator or repressor? B. Explain how an effector molecule, which binds to the regulatory protein, alters the regulatory protein’s ability to regulate expression of the gene. 2. (1 pt) Cis and trans are two terms used to describe mutations. A. Explain the molecular difference between these terms. B. indicate which type of mutation (cis or trans) is dominant to wild-type and which...
#59) During protein synthesis, what happens to the ribosome? A) attach to the mRNA molecule and...
#59) During protein synthesis, what happens to the ribosome? A) attach to the mRNA molecule and travel along its length B) attach to the DNA molecule and travel along its length to produce an mRNA molecule C) Translate mRNA into tRNA D) Transcribe mRNA to tRNA E) Translate mRNA into DNA #60) if you digested the human genome (3 billion bp) with a 7-cutter restriction enzyme, approximately how many fragments would you get? A) 511461 B)183105 C)16384 D)88 E) None...
please help me with the question 15 to 18. Basic structure of an operon Note that...
please help me with the question 15 to 18.
Basic structure of an operon Note that the diagram below is one section of DNA master strend with some areas of DNA labeled in blocks The bracketed area illustrates the basic parts of an operon repressor gene promoter operator structural genes DNA 3 mRNA 5 - 3 repressor protein shown attached to operator #2 Repressor preten "Use purple to color in the repressor gene. The repressor gene codes for a repressor...
Questions for lab report: 1. Do the results show that expression of B-galactosidase is inducible? If...
Questions for lab report: 1. Do the results show that expression of B-galactosidase is inducible? If so what is the inducer? 2. Is catabolite repression demonstrated by any of the cultures? 3. One of the strains used was wild type, and the other two were mutants. Based on your observation of the phenotypes of each strain, and your knowledge of the lac operon, which two are likely to be the mutants? What gene or region is likely to be mutated...
for 1-5 define those The Lac operon is an inducible set of genes found in bacteria...
for
1-5 define those
The Lac operon is an inducible set of genes found in bacteria cells that helps the bacteria to metabolize the disaccharide lactose. When it is turned on it produces proteins that pump lactose into the bacteria cell and break it down into glucose and galactose, which can then be used by the bacteria as a source of energy The two figures below show the Lac Operon along with the lacl gene (which regulates the Lac operon...
1.explain the difference between positive and negative feedback control. 2.define/describe “operon.” 3.diagram and explain the function...
1.explain the difference between positive and negative feedback control. 2.define/describe “operon.” 3.diagram and explain the function of the lac operon. Know what happens in the “on” and “off” states, and how the cell switches between them.
1. Describe how bacteria regulate genes through operons. 2. What is the difference between a repressible and inducible genetic system? 3. Expression of the Lac operon is under the controls of (1) the Lacl repressor and (2) CAP. Consider each of the following conditions and determine which factors will be acting on the operon. Predict the rate of gene expression. Conditions Lac Operon fon" or "off" CAP present" or "absent" at Lac Operon Predict the rate of gene expression (none,...
9. Using the diagram of the lac operon (regulates transcription of genes for lactose metabolizing enzymes) below, draw the appropriate positions for RNA polymerase and the CAP activator molecule when CAMP is present. Then draw the appropriate position for the repressor molecule when lactose is present as an inducer. Finally, indicate whether or not transcription occurs. (8 pts) Promoter Operator Gene 1 Gene 2 Gene 3
Question 12 2 pts What is the role of CAMP in regulation of the lactose operon? CAMP is a repressor of the lactose operon and turns off gene expression of the lactose operon CAMP is an activator and prevents the repressor protein from binding to the operator region of the operon which allows for the lactose operon to be turned "on". 5 CAMP is an inducer of the lactose operon and also an activator since it prevents the repressor protein...
please help me with the question 15 to 18.
Basic structure of an operon Note that the diagram below is one section of DNA master strend with some areas of DNA labeled in blocks The bracketed area illustrates the basic parts of an operon repressor gene promoter operator structural genes DNA 3 mRNA 5 - 3 repressor protein shown attached to operator #2 Repressor preten "Use purple to color in the repressor gene. The repressor gene codes for a repressor...
Questions for lab report: 1. Do the results show that expression of B-galactosidase is inducible? If so what is the inducer? 2. Is catabolite repression demonstrated by any of the cultures? 3. One of the strains used was wild type, and the other two were mutants. Based on your observation of the phenotypes of each strain, and your knowledge of the lac operon, which two are likely to be the mutants? What gene or region is likely to be mutated...
for
1-5 define those
The Lac operon is an inducible set of genes found in bacteria cells that helps the bacteria to metabolize the disaccharide lactose. When it is turned on it produces proteins that pump lactose into the bacteria cell and break it down into glucose and galactose, which can then be used by the bacteria as a source of energy The two figures below show the Lac Operon along with the lacl gene (which regulates the Lac operon...
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