In the same bacterial cell, different sigma factors are able to control the expression of large...
In the same bacterial cell, different sigma factors are able to control the expression of large blocks of genes. True/False
Homework Answers
Yes. In one bacterial cell different sigma factors can control the expression of genes. Different sigma factors bind to distinct set of promotor. Thus Thus when transcription is completed using a single RNA polymerase, the use of difference sigma factors provide extra level of control .
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In the same bacterial cell, different sigma factors are able to
control the expression of large...
In eukaryotic cells, there are specific transcription factors (activators) that regulate gene expression. Describe the organization...
In eukaryotic cells, there are specific transcription factors (activators) that regulate gene expression. Describe the organization of eukaryotic genes (i.e. promoters/enhancers) and how transcription factors are able to control gene expression and enzyme activity. a) Throughout the course we discussed the enzyme lactase and how it is differently regulated (and therefore expressed) in different human populations. Describe how this gene is differently expressed in different populations and when this/these change(s) are predicted to have taken place. b) Differential gene expression...
Question 13 (1 point) Alternative sigma factors initiate transcription in different genes by recognizing characteristic sequences...
Question 13 (1 point) Alternative sigma factors initiate transcription in different genes by recognizing characteristic sequences in their 1) RNA polymerase 2) activation sites 3) promoters 4) enhancer 5) operator FUSION1 u point) Genes whose transcription is controlled by the same regulatory elements are said be under: 1) positive control 2) negative control 3) allosteric control 4) coordinated control 5) epigenetic control Question 16 (1 point) In the presence of both arabinose and glucose the arabinose operon is:
1. trans-acting factors are able to regulate target genes from any chromosome, whereas cis-acting elements can...
1. trans-acting factors are able to regulate target genes from any chromosome, whereas cis-acting elements can only regulate genes located in the same chromosome. a. True only in operons. In Eukaryotic systems, trans-acting factors only regulate genes in the same chromosome. b. True only in Eukaryotes. Prokaryotes don’t have cis-acting elements. c. True for any organism. d. False. The statement is erroneous 2. Unlike activators, repressors never affect chromatin structure. Repressors inhibit transcription only by binding to the binding sites...
Various sigma factors play a role in gene expression by Choose one: A. allowing for binding...
Various sigma factors play a role in gene expression by Choose one: A. allowing for binding of various enhancer proteins to aid initiation. O B. bringing about an early termination due to hairpins in the message. C. using alternate nucleotides to promote different genes. O D. binding to a variety of different -10 and -35 sequences.
Help & check QUESTION 1 A cell can change the expression of its genes in response to external signals. O Tr...
Help & check
QUESTION 1 A cell can change the expression of its genes in response to external signals. O True False QUESTION 2 Different cell types that respond to the same environmental stimulus would most likely turn on a different set of genes in responce. O True O False QUESTION 3 DNA polymerase can be considered a house-keeping protein. True False
QUESTION 1 Hox genes are genes that code for transcription factors. What do transcription factors do?...
QUESTION 1 Hox genes are genes that code for transcription factors. What do transcription factors do? A. Bind to DNA to make it available for transcription B. Make up specific body parts C. Activate ribosomes QUESTION 2 Genes that need to be turned on at the same time (for example, the genes that encode the proteins that build toes) will all respond to the same transcription factor. A. True B. False QUESTION 3 Hox genes are sometimes called "master switches"....
4. Generalized transduction involves the transfer of phage genes from one bacterial cell to another. (Click...
4. Generalized transduction involves the transfer of phage genes from one bacterial cell to another. (Click to select) ✓ True False
NF-kappa B (NFKB) proteins are transcription factors that control the expression of genes involved in cellular...
NF-kappa B (NFKB) proteins are transcription factors that control the expression of genes involved in cellular processes such as proliferation, differentiation inflammation, and apoptosis. Dysfunction within the NFkB pathway can trigger indefinite cell proliferation and cell survival leading to the development of tumors. Stimul OS NIYA W IDTNOM IMAM IMENOVE 1. Explain how NFKB proteins are activated to promote cell survival. 2. How would a cell evade apoptosis if an IB Inhibitor of kappa B) protein could no longer bind...
Why does E. coli have several different sigma factors? A.They allow RNA polymerase I, RNA polymerase...
Why does E. coli have several different sigma factors? A.They allow RNA polymerase I, RNA polymerase II and RNA polymerase III to bind to different promoters. B.They allow the different subunits of the RNA polymerase holoenzyme to bind to each other. C.They are redundant in case one is mutated. They all perform the same function. D.One is needed to transcribe mRNA. A second is needed to transcribe tRNA. And a third is needed to transcribe rRNA. E.They are used if...
3. If each sigma factor recognizes a different promoter consensus sequence, how does the cell transcribe...
3. If each sigma factor recognizes a different promoter consensus sequence, how does the cell transcribe a gene that responds to multiple conditions, where each condition utilizes a different sigma factor? What would happen to overall gene expression profiles if RpoS were artificially overexpressed and why?
Question 13 (1 point) Alternative sigma factors initiate transcription in different genes by recognizing characteristic sequences in their 1) RNA polymerase 2) activation sites 3) promoters 4) enhancer 5) operator FUSION1 u point) Genes whose transcription is controlled by the same regulatory elements are said be under: 1) positive control 2) negative control 3) allosteric control 4) coordinated control 5) epigenetic control Question 16 (1 point) In the presence of both arabinose and glucose the arabinose operon is:
Various sigma factors play a role in gene expression by Choose one: A. allowing for binding of various enhancer proteins to aid initiation. O B. bringing about an early termination due to hairpins in the message. C. using alternate nucleotides to promote different genes. O D. binding to a variety of different -10 and -35 sequences.
Help & check
QUESTION 1 A cell can change the expression of its genes in response to external signals. O True False QUESTION 2 Different cell types that respond to the same environmental stimulus would most likely turn on a different set of genes in responce. O True O False QUESTION 3 DNA polymerase can be considered a house-keeping protein. True False
4. Generalized transduction involves the transfer of phage genes from one bacterial cell to another. (Click to select) ✓ True False
NF-kappa B (NFKB) proteins are transcription factors that control the expression of genes involved in cellular processes such as proliferation, differentiation inflammation, and apoptosis. Dysfunction within the NFkB pathway can trigger indefinite cell proliferation and cell survival leading to the development of tumors. Stimul OS NIYA W IDTNOM IMAM IMENOVE 1. Explain how NFKB proteins are activated to promote cell survival. 2. How would a cell evade apoptosis if an IB Inhibitor of kappa B) protein could no longer bind...
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