Methionine is an amino acid made by E coli. The met (methionine) operon in E. coli...
Methionine is an amino acid made by E coli. The met (methionine) operon in E. coli responds to a repressor protein which itself is:
a. encoded by the operon
b. turned off when bound to methionine c. turned on when bound to methionine
d. unresponsive to any product of the methionine biosynthetic pathway
e. turned on when bound to tryptophan
Homework Answers
MetJ is a regulatory protein and when it combines with S-adenosylmethionine (i.e. SAM), it represses the expression of methionine operon and of enzymes involved in SAM synthesis. Met J itself is autoregulated. .i.e. by the presence of methionine
(b) i.e. turned off when bound to methionine
In place SAM Met can bind as in the following ref
http://pubs.rsc.org/en/content/articlehtml/2009/ob/b816495a
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Methionine is an amino acid made by E coli. The met (methionine)
operon in E. coli...
The enzymes required for protein synthesis of the amino acid tryptophan in E. coli are all...
The enzymes required for protein synthesis of the amino acid tryptophan in E. coli are all encoded in a single transcription unit, the trp operon. Transcription of the trp operon is only ignited when the cell has low levels of free tryptophan. Briefly describe how initiation of transcription of the trp operon is regulated in response to the availability of free tryptophan.
Where is the amino acid covalently attached on a charged tRNA? Question 29 options: at the...
Where is the amino acid covalently attached on a charged tRNA? Question 29 options: at the 3' end on the T arm on the anticodon loop on the D arm at the 5' end Question 28 (1 point) The substrate for the maintenance methyl-transferase in eukaryotic cells is most similar to which of the following? Question 28 options: a double-stranded break DNA just after replication in E.coli a tRNA DNA just after replication in S.cerevisiae (yeast) a restriction endonuclease site...
26. The first amino acid incorporated into a growing polypeptide A. In bacteria is methionine and...
26. The first amino acid incorporated into a growing polypeptide A. In bacteria is methionine and it is also methionine in eukaryotes B. In bacteria is tryptophan, while it is methionine in eukaryotes C. In bacteria is N-formyl methionine, while it is methionine in eukaryotes D. In bacteria is N-formyl methionine and it is also N-formyl methionine in eukaryotes E. In bacteria is methionine, while it is N-formyl methionine in eukaryotes 27. In E. coli the IF3 forces tRNAf Met...
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...
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...
26. The lac operon in E. coli consists of genes that code for enzymes necessary for...
26. The lac operon in E. coli consists of genes that code for enzymes necessary for the breakdown of lactose. When lactose is absent, the operon is inactive because a repressor protein binds to a specific site in the lac operon. When lactose is present, lactose molecules bind to the repressor protein, causing the repressor protein to dissociate from the binding site. In the absence of glucose (a preferred energy source for bacteria), the protein CAP binds to a regulatory...
1. The terminating "hairpin" loop occurs in the tryptophan operon when ________. A. sufficient glucose is...
1. The terminating "hairpin" loop occurs in the tryptophan operon when ________. A. sufficient glucose is present. B. sufficient tryptophan is present. C. insufficient tryptophan is present. D. insufficient glucose is present. E. None of the above 2. When tryptophan is present in the medium and available to the bacterium, ________. A. the repressor is inactive and the tryptophan operon is "off" B. the repressor is inactive and the tryptophan operon is "on" C. the repressor is bound to the...
E. coli can be found in a pond. If very high amounts of tryptophan are present...
E. coli can be found in a pond. If very high amounts of tryptophan are present in this environment, then which of the following conditions would likely be occurring in E. coli? Choose YES if that condition would likely be occurring, or NO if that condition would not likely be occurring. Yes No The first enzyme (or enzyme complex) in the biosynthetic pathway for tryptophan synthesis is inhibited by feedback inhibition. Yes No The leader-attenuator region of the trp mRNA forms hairpins...
The genotypes of the lac operon of several haploid and partial diploid E. coli strains are...
The genotypes of the lac operon of several haploid and
partial diploid E. coli strains are given. For each genotype,
indicate the status of B-galactosidase synthesis as either Yes or
No. Assume that no glucose is present and cAMP is rich in the
growth medium.
• Oc is a mutant operator that cannot be bound
by the wild type repressor protein.
• Is is a mutant of repressor gene and cannot
bind to operator
Haploid Partial Diploid IOZY IOCZY ISOZY...
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...
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...
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...
26. The lac operon in E. coli consists of genes that code for enzymes necessary for the breakdown of lactose. When lactose is absent, the operon is inactive because a repressor protein binds to a specific site in the lac operon. When lactose is present, lactose molecules bind to the repressor protein, causing the repressor protein to dissociate from the binding site. In the absence of glucose (a preferred energy source for bacteria), the protein CAP binds to a regulatory...
The genotypes of the lac operon of several haploid and
partial diploid E. coli strains are given. For each genotype,
indicate the status of B-galactosidase synthesis as either Yes or
No. Assume that no glucose is present and cAMP is rich in the
growth medium.
• Oc is a mutant operator that cannot be bound
by the wild type repressor protein.
• Is is a mutant of repressor gene and cannot
bind to operator
Haploid Partial Diploid IOZY IOCZY ISOZY...
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...
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