9) Which posttranslational modification does not occur on histone tails? (a) Phosphorylation (b) Germination (c) Acetylation...
9) Which posttranslational modification does not occur on histone tails?
(a) Phosphorylation
(b) Germination
(c) Acetylation
(d) Methylation
Homework Answers
1. Germination does not occur as post translational modification on histone cells. Methylation , acetylation, phosphorylation can occur on lysine, arginine residues of histones to activate or deactivate the genes.
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9) Which posttranslational modification does not occur on
histone tails?
(a) Phosphorylation
(b) Germination
(c) Acetylation...
Which statements about the modification of chromatin structure in eukaryotes are true? 2 pts a. Acetylation...
Which statements about the modification of chromatin structure in eukaryotes are true? 2 pts a. Acetylation of histone tails in chromatin allows access to DNA for transcription. b. Histone proteins are always permanently placed along a DNA sequence but the binding to DNA can be loosened. c. Methylation of DNA is associated with the gene activation. d. Acetylation of histone tails is a reversible process. e. Some forms of chromatin modification can be passed on to future generations of cells.
Which of the following histone modifications generally PREVENTS transcription from occurring? Methylation o acetylation Demethylation Phosphorylation
Which of the following histone modifications generally PREVENTS transcription from occurring? Methylation o acetylation Demethylation Phosphorylation
Which statements about the modification of chromatin structure in eukaryotes are true? 1.DNA is not transcribed...
Which statements about the modification of chromatin structure in eukaryotes are true? 1.DNA is not transcribed when chromatin is packaged tightly in a condensed form 2.Some forms of chromatin modification can be passed on to future generations of cells 3.Acetylation of histone tails in chromatin allows access to DNA for transcription 4.Acetylation of histone tails is a reversible process. 5. Methylation of histone tails in chromatin can promote condensation of the chromatin 6. Deacetylation of histone tails in chromatin loosens...
Regulation of Gene Expression in Eukaryotes Part A -Modification of chromatin structure Which statements about the...
Regulation of Gene Expression in Eukaryotes Part A -Modification of chromatin structure Which statements about the modification of chromatin structure in eukaryotes are true? Select all that apply. View Available Hint(s) Acetylation of histone tails is a reversible process Some forms of chromatin modification can be passed on to future generations of cells. DNA is not transcribed when chromatin is packaged tightly in a condensed form. O Acetylation of histone tails in chromatin allows access to DNA for transcription. Deacetylation...
In contrast to histone acetylation, which always correlates with gene activation, histone methylation can lead to...
In contrast to histone acetylation, which always correlates with gene activation, histone methylation can lead to either transcriptional activation or repression. How do you suppose that the same modification - methylation - can mediate different biological outcomes? Explain what is meant when we say two DNA sequences are 'highly conserved'. Why are some sequences conserved and others aren't? In your own words, explain what is meant by "position effect". What is the molecular basis of this phenomenon?
Which of the following accurately matches a histone tail modification with its effect on transcription? Group...
Which of the following accurately matches a histone tail modification with its effect on transcription? Group of answer choices a Methylation of lysine 4 on the H3 tail activates transcription of downstream genes b Methylation of lysine 4 on the H3 tail activates transcription of upstream genes c Acetylation of lysine 16 on H4 prevents transcription from taking place by blocking RNA polymerase from binding d Acetylation of lysine 16 on H4 prevents transcription from taking place by preventing nucleosome...
ton is not an energy dependent process in (B)) Falls eukaryotes 43. Histone methylation is associated...
ton is not an energy dependent process in (B)) Falls eukaryotes 43. Histone methylation is associated with Falls gene activation gene silencing Following histones are required during transcription (A) H2A and 2B (B) H3 (C) H4 (D) All of the above (E) H2AZ (c) induction (D) All of the above (E) None of the above 35. 4. DNA methylation silences gene expression AD True (B) Fall Leucine residues in lucine zipper proteins provides h ydrophobic interaction for dimerization (A) True...
u/access/content/group/32962675-55a6-4875-9705-ataca/205002/ 29. David Seligson and his colleagues examined levels of histone protein modification in prostate tumors...
u/access/content/group/32962675-55a6-4875-9705-ataca/205002/ 29. David Seligson and his colleagues examined levels of histone protein modification in prostate tumors and their association with clinical outcomes (D. B. Seligson et al. 2005. Nature 435:1262-1266). They used antibodies to stain for acetylation at three different sites and for methylation at two different sites on histone proteins. They found that the degree of histone acetylation and methylation helped predict whether prostate cancer would return within 10 years in the patients who had a prostate tumor removed....
Which of the following hypothesizes that the physical and functional status of a certain region of genomic chromatin is dependent upon the patterns of specific histone posttranslational modifications...
Which of the following hypothesizes that the physical and functional status of a certain region of genomic chromatin is dependent upon the patterns of specific histone posttranslational modifications and/or DNA methylation status? a. PTM hypothesis b. Nuclear body hypothesis c. Epigenetic code d. Genetic code
1.Which of the following modification marks a protein for degradation in proteasomes? A.) Phosphorylation B.)ubiquitinylation C.)...
1.Which of the following modification marks a protein for degradation in proteasomes? A.) Phosphorylation B.)ubiquitinylation C.) acetylation D.) glycosylation 2. A reaction with a positive ∆G value can be made energetically favorable by increasing the A.) Delta G B.)starting concentration of products C.) strting concentration of freactants (substrates) D.) a or b
Which of the following histone modifications generally PREVENTS transcription from occurring? Methylation o acetylation Demethylation Phosphorylation
Regulation of Gene Expression in Eukaryotes Part A -Modification of chromatin structure Which statements about the modification of chromatin structure in eukaryotes are true? Select all that apply. View Available Hint(s) Acetylation of histone tails is a reversible process Some forms of chromatin modification can be passed on to future generations of cells. DNA is not transcribed when chromatin is packaged tightly in a condensed form. O Acetylation of histone tails in chromatin allows access to DNA for transcription. Deacetylation...
In contrast to histone acetylation, which always correlates with gene activation, histone methylation can lead to either transcriptional activation or repression. How do you suppose that the same modification - methylation - can mediate different biological outcomes? Explain what is meant when we say two DNA sequences are 'highly conserved'. Why are some sequences conserved and others aren't? In your own words, explain what is meant by "position effect". What is the molecular basis of this phenomenon?
ton is not an energy dependent process in (B)) Falls eukaryotes 43. Histone methylation is associated with Falls gene activation gene silencing Following histones are required during transcription (A) H2A and 2B (B) H3 (C) H4 (D) All of the above (E) H2AZ (c) induction (D) All of the above (E) None of the above 35. 4. DNA methylation silences gene expression AD True (B) Fall Leucine residues in lucine zipper proteins provides h ydrophobic interaction for dimerization (A) True...
u/access/content/group/32962675-55a6-4875-9705-ataca/205002/ 29. David Seligson and his colleagues examined levels of histone protein modification in prostate tumors and their association with clinical outcomes (D. B. Seligson et al. 2005. Nature 435:1262-1266). They used antibodies to stain for acetylation at three different sites and for methylation at two different sites on histone proteins. They found that the degree of histone acetylation and methylation helped predict whether prostate cancer would return within 10 years in the patients who had a prostate tumor removed....
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