Which modifications, correctly paired, serve to reduce gene expression? histone deacetylation and DNA methylation histone acetylation and DNA methylation histone deacetylation and DNA demethylation neither histone acetylation or DNA methylation affect expression more than one answer is correct
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DNA methylation: This process involves the addition of a methyl group to the DNA molecule, typically at cytosine bases. Methylation often occurs in regions called CpG islands, which are found near gene promoters. When these regions are methylated, gene expression Show more…
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Question: Methylation, acetylation, and other histone modifications are important because they are associated with: A. cancer genes and their regulation. B. chromatin remodeling and thereby affect gene transcription . C. the environmental and developmental cues that determine whether viral genes and genes in transposable elements are turned off or on. D. All these choices are correct.
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Which of the following is an example of how histone modifications help to control gene expression? a When a negatively charged amino acid in a histone tail is neutralized, the interactions between the histone and the associated DNA are stronger and gene expression tends to be weaker b When a histone tail is acetylated, it loosens the DNA wound around it making it more accessible to RNA transcription c When a histone tail is methylated, the individual histone subunits fall apart and gene expression is blocked
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