Heterochromatin is chromatin that is very compact, containing genes that are silenced. What epigenetic modifications might you find in heterochromatin?
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Heterochromatin is chromatin that is very compact, containing genes that are silenced. What epigenetic modifications might you find in heterochromatin?
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- Changes in chromatin packing correlate with changes in gene expression in most cells. Why do you think this is the case?Why do chromosomes have moredifferent types of nonhistone than histone proteins?Which of the following statements is NOT true about chromatin architecture? A. The histone tails on heterochromatin are deacetylated B. Heterochromatin is heavily methylated C. Euchromatin is more likely to contain genes that are expressed at that time D. Euchromatin is heavily methylated
- What condition must be fulfilled in order for histone modification to be considered an epigenetic phenomenon? Does DNA methylation meet that criterion? Explain.Heterochromatin and Euchromatin Have Which Different Histone modificationsWhich of the following could represent an epigenetic modification in a cell? A. Deletion of chromosome 18 B. Acetylation of histone H3 C. Deletion of a 20-nucleotide segment of chromosome 3 D. Conversion of an A to a T within a gene E. Duplication of chromosome 13
- Loosening the chromatin structure occurs because of Select one: a. Lysine methylation b. Lysine acetylation c. Lysine phosphorylation d. Lysine sumoylationWhy is transcriptionally active chromatin ∼10 times more susceptible to cleavage by DNase I than transcriptionally silent chromatin?Which region of chromatin is transcriptionally silent?a) Nucleoidb) Centromerec) Euchromatind) Heterochromatin
- Many proteins other than histones are found associated with chromosomes. What roles do these nonhistone proteins play? Why do chromosomes have moredifferent types of nonhistone than histone proteins?Which of the following is likely to be transcriptionally expressed? euchromatin and DNA with methyl groups euchromatin DNA with methyl groups DNA with acetylated histones euchromatin and DNA with acetylated histonesSince all cells contain the same number of chromosomes and the overall same/similar genome how would the genome in a nerve cell work differently than the genome of a muscle cell? In other words what epigenetic processes cause these differences between cell types at the molecular level