Which of the following is a true statement about histone modification and gene expression? Question options: Histone modification is random and independent of the environment. Histone modification changes over time in response to environmental cues, but this has no effect on gene expression. Histone modification can be changed in response to cues from the environment. Once a histone is modified and gene is "turned off" this change is permanent.
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This is because histone modification is a dynamic process that can be influenced by various environmental factors such as stress, diet, and exposure to toxins. Show more…
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Histone modification: a. Can change over time in response to environmental cues, allowing genes to be turned on or off as needed. b. Is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turned on or off permanently. c. Is random; sometimes the lysines are modified and sometimes they're not, but the state is independent of the environment or cell type. d. Is fixed, but this has no effect on whether genes are expressed. e. Can change over time in response to environmental cues, but this has no effect on gene expression.
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Which of the following is true of epigenetic changes? a. They only allow gene expression. b. They allow movement of histones. c. They change the DNA sequence. d. They are always heritable.
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