'Question 7 Which statements about the modification of chromatin structure in eukaryotes are true? DNA is not transcribed when chromatin is packaged tightly in a condensed form Methylation of histone tails in chromatin can promote condensation of the chromatin Acetylation of histone tails in chromatin allows access to DNA for transcription Acetylation of histone tails is a reversible process All of the above are true statements of the modification of chromatin structure in eukaryotes'
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DNA is not transcribed when chromatin is packaged tightly in a condensed form: This statement is true. When chromatin is tightly packed, it is difficult for the transcription machinery to access the DNA, and therefore transcription is inhibited. Show more…
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Which statements about the modification of chromatin structure in eukaryotes are true? a. Acetylation of histone tails in chromatin allows access to DNA for transcription. b. Histone proteins are always permanently placed along a DNA sequence but the binding to DNA can be loosened. c. Methylation of DNA is associated with the gene activation. d. Acetylation of histone tails is a reversible process. e. Some forms of chromatin modification can be passed on to future generations of cells.
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Which of the following statements about chromatin is FALSE? There are regions of the chromosomes that stay heterochromatic through almost the whole life of an individual and the genes in these regions are almost never expressed. The state of the chromatin is usually erased during mitosis, so daughter cells usually have different patterns of DNA and histone methylation compared to the maternal cell. Frequently, the chromatin state of a particular chromosomal region could change from euchromatin to heterochromatin and back during different developmental stages or in different tissues Chromatin state is regulated by modifications of DNA and histone proteins
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Which are true of prokaryotic and eukaryotic chromosomes? Eukaryotic chromosomes have multiple origins of replication per chromosome. Prokaryotic DNA coils in a form of nucleosomes. Eukaryotic DNA is bound to histone proteins. Prokaryotic chromosomes have a single origin of replication per chromosome. Prokaryotic chromosomes are usually not associated with proteins. Eukaryotic DNA forms nucleosomes by associating with triplets of histone proteins.
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