Which of the following is true about epigenetic modifications? -Epigenetic modifications always repress transcription -Epigenetic modifications are irreversible -Epigenetic modifications only occur on the tails of histone proteins -Epigenetic modifications influence the relationship between DNA and histone proteins

Which of the following is true about epigenetic modifications? -Epigenetic modifications always repress transcription -Epigenetic modifications are irreversible -Epigenetic modifications only occur on the tails of histone proteins -Epigenetic modifications influence the relationship between DNA and histone proteins

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter9: Molecular Biology

Section: Chapter Questions

Problem 10RQ: Control of gene expression in eukaryotic cells occurs at which level(s)? a. only the transcriptional...

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Epigenetic marks regulate gene expression. Which epigenetic mark is NOT associated with positive gene expression? Histone acetylation Histone Methylation De-methylated DNA Methylated DNA
Specific environmental or nongenetic factors can cause epigenetic modifications. Identical twins have essentially the same DNA sequences; however, aging and significant lifestyle differences cause changes in _____ because: Genomic imprinting Histone modification Chromatin structure DNA methylation
Epigenetic changes in gene regulation are caused by ________. missing nucleotides or chromosomes missing nucleotides or chromosomes mutations of the nucleotide sequence mutations of the nucleotide sequence modifications to histones and the DNA, but not the nucleotide sequence itself
Epigenetic changes in gene regulation are caused by _ _ _ _ _ _ _ a. missing nucleotides or chromosomes b. modifications to histones and the DNA, but not the nucleotide sequence itself c. mutations of the nucleotide sequence
Epigenetic marks regulate gene expression. Which epigenetic mark is NOT associated with positive gene expression? A. Histone acetylation B. Histone Methylation C. De-methylated DNA D. Methylated DNA
Epigenesis relating to genetics refers to which of the following A. Genetic information is limited to what we inherit only from our biological parents. B. Genes are not influenced by environmental factors. C. Genes we inherit are fully expressed at birth. D. Genes are turned on or off as needed, by the developing body or environmental triggers, across the life-span
Which of the following is a method through which cells can control their gene expression? Increase a gene's stability using post-translational modifications Epigenetic modifications of the DNA or histones to regulate DNA avilability phosphorylation of thymidines formation of crosslinks between the DNA strands and the histones
What epigenetic modification(s) would you expect to see near a gene promoter where transcription is occurring? Histone acetylation 2.)Histone methylation 3.)DNA methylation 4.) a&c 5.) b&c
In your own words, explain epigenetics. What is it? What are the main epigenetic marks? What do they do in terms of gene transcription? What are the enzymes involved?
Which of the following is not a possible outcome of changing the epigenetic code? a) exposure of regulatory region b) binding of transcription factors c) altered gene expression d) repositioning of nucleosomes by polymerases
Which 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
The study of Epigenetics includes which of the following? (Choose all that apply) 1.The vertical transmission of histone modifications 2.The vertical transmission of genetic mutations 3.How Histone acetylation affects gene transcription 4.How DNA methylation impacts chromatin structure 5.How genetic mutations impact gene transcription 6.The horizontal transmission of genes