The following is true about epigenetic gene control: O epigenetic changes to the chromatin may result from childhood development O epigenetic changes to the chromatin may result from chemicals in the environment epigenetic changes to the chromatin may result in cancer An example of a chromatin change is DNA methylation that prevents gene expression from that area of the DNA

The following is true about epigenetic gene control: O epigenetic changes to the chromatin may result from childhood development O epigenetic changes to the chromatin may result from chemicals in the environment epigenetic changes to the chromatin may result in cancer An example of a chromatin change is DNA methylation that prevents gene expression from that area of the DNA

Name: The following is true about epigenetic gene control:O epigenetic chan
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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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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
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 marks regulate gene expression. Which epigenetic mark is NOT associated with positive gene expression? Histone acetylation Histone Methylation De-methylated DNA Methylated DNA
Epigenetic modification of gene expressiona. always inhibits gene transcription.b. always stimulates gene expression.c. is erased from the DNA following mitotic cell division.d. may sometimes be transmitted from generation to generation.
Which of the following is not a major mechanism of epigenetic change? a. DNA methylation b. Alteration of a DNA base sequence in a promoter c. Histone acetylation d. Action of RNA molecules
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
Epigenetic control of gene expressiona. is hereditary. c. adds methyl groups to cytosine.b. locks genes “ON.” d. Two of these
Which of the following are examples of molecular changes thatcan have an epigenetic effect on gene expression?a. Chromatin remodelingb. Covalent histone modificationc. Localization of histone variantsd. DNA methylatione. Feedback loopsf. All of the above
The phenotype of a heterozygous mouse (Aa) is agouti. The agouti banding pattern is due to altered expression of the agouti gene. Which of the following statement is false? a) Expression of the agouti gene inhibits the production of eumelanin. b) Evidence suggests that the agouti gene is only expressed in tissues associated with fur production. c) Epigenetic markers silence the agouti gene resulting in dark pigmentation at the tip and root of the hair. d) All of the above
Which of the following is NOT a description of an epigenetic modification? A. regulatory patterns that persisis in the absence of the original signal B. stable alterations in gene expression without changes to the underlying DNA sequence C. the persistence of gene expression patterns through cell division D. an intrinsic signal that triggers cell differentiation
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
Many oncogenes result from mutations that cause excessive expression of a protein in cells where it is normally not expressed or is expressed at inappropriate times during development. This type of mutation can be described as ________. A) amorphic B) hypomorphic C)hypermorphic D) neomorphic E) dominant negative