Which of the following mechanisms is (are) used to coordinate the expression of multiple, related genes...
Which of the following mechanisms is (are) used to coordinate the expression of multiple, related genes in eukaryotic cells?
| a. |
The genes are organised into an operon, allowing them to be co-ordinately controlled as a single unit. |
|
| b. |
The genes have enhancers with similar control elements, which allows appropriate activators to turn on their transcription at the same time. |
|
| c. |
A single repressor is able to turn off several related genes. |
|
| d. |
Environmental signals enter the cell and bind directly to promoters. |
Homework Answers
The similar kinds of genes contains the enhancer elements of same type. Enhancer the the sequence of DNA at which an activator can bind. Once an activator binds to all the enhancer it activates the expression of all the genes.
Option B is correct.
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Which of the following mechanisms is (are) used to coordinate
the expression of multiple, related genes...
Which of the following is not true regarding regulation of gene expression in eukaryotes? In eukaryotic...
Which of the following is not true regarding regulation of gene expression in eukaryotes? In eukaryotic cells, transcriptional activators often work by recruiting the transcriptional macinery to gene promoters DNA methylation is an example of an epigenetic mark that can be inherited Acetylation of histones can result in a more open chromatin structure to allow transcription to occur Different genes can be turned off or on between different organs or stages of development Transcription factor DNA sequences are bound by...
Yet, all the cells in your body contain the same genes (and same alleles). The difference...
Yet, all the cells in your body contain the same
genes (and same alleles). The difference across cell types
is that genes get selectively expressed (turned on or off)
based on the proteins needed for cellular function given their
environment.
Select which statement explains the reason why hair does not
normally grow on your muscle cells.
a.
Muscle cells have the gene for keratin, but do not express
it
b.
Muscle cells do not have the gene for keratin and...
Prokaryotes can coordinate the expression of genes for a specific function by grouping them into an...
Prokaryotes can coordinate the expression of genes for a specific function by grouping them into an operon, which is controlled by a single promotor. Which of the following allows eukaryotes to have similar coordinated control over a set of genes for a specific function? A single transcriptional regulator controlling multiple genes. Multiple transcriptional regulators controlling a gene. RNA interference Post-transcriptional controls
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...
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...
1) Which of the following conditions is most likely to cause the lactose operon to be...
1) Which of the following conditions is most likely to cause the lactose operon to be transcribed? A) There is more glucose in the cell than lactose. B) There is glucose but no lactose in the cell. C) The cyclic AMP and lactose levels are both high within the cell. D) The CAMP level is high and the lactose level is low. 2) How does the transcription of structural genes in an inducible operon occur? A) It occurs continuously in...
Which of the following mechanisms to regulate gene expression are observed in eukaryotes, but are not...
Which of the following mechanisms to regulate gene expression are observed in eukaryotes, but are not generally observed in prokaryotes? Choose all that apply. Genes are grouped into operons, which allows transcriptional regulation to turn them all on together. RNA silencing selectively targets mRNA and destroys it to prevent further translation. Proteins can be activated or deactivated as a form of post-translational regulation. Epigenetic regulation can open or condense sectiosn of a chromosome, regulating which genes are transcribed. Regulatory proteins...
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high...
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high glucose d) Low lactose, low glucose e) None of the above would have any lac operon expression 2. (2 points) Which of the following is true concerning molecular genetics? a) tRNA carries amino acids into the nucleus in eukaryotic cells b) DNA polymerase moves towards the...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance of trp B. The trp operon would be transcribed much less than...
need to know correct answers 26. B. Which of the following enzymes is associated with the...
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...
Yet, all the cells in your body contain the same
genes (and same alleles). The difference across cell types
is that genes get selectively expressed (turned on or off)
based on the proteins needed for cellular function given their
environment.
Select which statement explains the reason why hair does not
normally grow on your muscle cells.
a.
Muscle cells have the gene for keratin, but do not express
it
b.
Muscle cells do not have the gene for keratin and...
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...
1) Which of the following conditions is most likely to cause the lactose operon to be transcribed? A) There is more glucose in the cell than lactose. B) There is glucose but no lactose in the cell. C) The cyclic AMP and lactose levels are both high within the cell. D) The CAMP level is high and the lactose level is low. 2) How does the transcription of structural genes in an inducible operon occur? A) It occurs continuously in...
Quiz 10 1. (2 points) Which of the following conditions would lead to the highest levels of lac operon expression? a) High lactose, high glucose b) High lactose, low glucose c) Low lactose, high glucose d) Low lactose, low glucose e) None of the above would have any lac operon expression 2. (2 points) Which of the following is true concerning molecular genetics? a) tRNA carries amino acids into the nucleus in eukaryotic cells b) DNA polymerase moves towards the...
expressed at high levels, comparable to its expression in the absence of trp 6. Based upon what you have learned about the E. coli trp operon, what could you say about expression of its structural genes in cells with large amounts of environmental trp, but expressing a mutant trp repressor that is unable to bind trp? A. The trp operon would be completely repressed due to the abundance of trp B. The trp operon would be transcribed much less than...
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...
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