Homework Answers
A. First option
If the activator protein will bind to the regulatory region of the DNA, then the operon will undergo transcription and not translation. Therefore first option is correct and second and third options are incorrect because they are talking about translation.
Last option is incorrect because activated protein is a type of regulatory protein and it will bind to the regulatory region of DNA and not the coding region.
B. 3rd, 4th
In first and second cases, there will be the expression of the given gene. It is because in first case activator is present and messenger RNA and protein is being formed.
In second case the repressor is repressed so the operon will be expressed.
In third case, transcription is not taking place because the activator is not properly bound to DNA. Therefore expression will not take place.
In the last case also, the repressor is bound to the operon so the transcription will not take place.
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Which of these student models shows repression of the lacz gene? Select all that apply. Activator...
Which of these student models shows repression of the lacz gene? Select all that apply. Activator Transription lacz Repressor loc2 Ropressor MRA Moz Activator WWWWWWWW lacz
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...
Question 1 Match the term with the best definition or description; most topics relate to the...
Question 1 Match the term with the best definition or description; most topics relate to the regulation of gene expression. General type of protein which will increase transcription rates when it attaches to a site A. Factor connected to a particular gene - B. Co-repressor C. Enhancer D. Promoter E. Structural F. Intron G. Activator H. Operator I. Basal transcription J. Glucocorticoid receptor K. Sigma factor L. Mediator M. Inducer N. TATA box O. Repressor The rates of mRNA produced...
2. Note whether the sentence is true or false on the line following each sentence. If...
2. Note whether the sentence is true or false on the line following each sentence. If a statement is false, cross out one incorrect word or phrase in the sentence and write the correct word on top of the incorrect word. a. When glucose levels are high, CAMP levels are high, leading to the binding of CAP. When lactose levels are high, the repressor will not be bound; this all leads to the activation of lacZ transcription in bacteria. b....
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...
need to know correct answers 26. B. Which of the following enzymes is associated with the...
need to know correct answers
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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...
This DNA sequence comes from part of a gene on a chromosome of a eukaryotic organism.
This DNA sequence comes from part of a gene on a chromosome of a eukaryotic organism. i) If the bottom strand of the sequence is the template strand and the top strand is the coding strand, circle the answer below that best represents the direction that RNA polymerase would move along the template DNA strand. Left to Right Right to Left Lagging to Leading A site to P site ii) Given the information in 6 i, write the sequence of the mRNA...
18. Which of the following statements correctly describe the role of transcription in the initiation of...
18. Which of the following statements correctly describe the role of transcription in the initiation of transcription in eukaryotes? A. Some transcription factors must bind to the promoter before RNA polymerası bind. B. Some transcription factors must bind to the promotor proximal element to en significant levels of mRNA production C. Some transcription factors can bind to enhancer elements thousands of base away from the gene D. Some transcription factors can bind to silencer elements that might be locate thousands...
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...
Which of these student models shows repression of the lacz gene? Select all that apply. Activator Transription lacz Repressor loc2 Ropressor MRA Moz Activator WWWWWWWW lacz
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...
Question 1 Match the term with the best definition or description; most topics relate to the regulation of gene expression. General type of protein which will increase transcription rates when it attaches to a site A. Factor connected to a particular gene - B. Co-repressor C. Enhancer D. Promoter E. Structural F. Intron G. Activator H. Operator I. Basal transcription J. Glucocorticoid receptor K. Sigma factor L. Mediator M. Inducer N. TATA box O. Repressor The rates of mRNA produced...
2. Note whether the sentence is true or false on the line following each sentence. If a statement is false, cross out one incorrect word or phrase in the sentence and write the correct word on top of the incorrect word. a. When glucose levels are high, CAMP levels are high, leading to the binding of CAP. When lactose levels are high, the repressor will not be bound; this all leads to the activation of lacZ transcription in bacteria. b....
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...
need to know correct answers
26. B. Which of the following enzymes is associated with the repression of transcription? methyl transferase DNA polymerasex acetyl transferase histone kinase none of the above Section 2 - True/False (2 points each) 27. TFIIB regulates tissue or cell type-specific transcription 28._1 Eukaryotes have three different RNA polymerases that each can transcribe non-protein coding genes. 29. T The P site of the ribosome refers to peptidyl. be For T heoph UND 30._F_The input genetic material...
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...
18. Which of the following statements correctly describe the role of transcription in the initiation of transcription in eukaryotes? A. Some transcription factors must bind to the promoter before RNA polymerası bind. B. Some transcription factors must bind to the promotor proximal element to en significant levels of mRNA production C. Some transcription factors can bind to enhancer elements thousands of base away from the gene D. Some transcription factors can bind to silencer elements that might be locate thousands...
the answer I gave was wrong
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