Which of the following is likely to be transcriptionally expressed? euchromatin and DNA with methyl groups euchromatin DNA with methyl groups DNA with acetylated histones euchromatin and DNA with acetylated histones
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Which of the following is likely to be transcriptionally expressed?
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euchromatin and DNA with methyl groups |
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euchromatin |
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DNA with methyl groups |
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DNA with acetylated histones |
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euchromatin and DNA with acetylated histones |
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- Chromatin decompaction is a preliminary step in gene expression (Figure 29.48). How is chromatin decompacted?Which of the following statements concerning eukaryotic chromatin is true. Histones have an overall negative charge. Euchromatin is more condensed then heterochromatin. After replication nucleosomes are made up of a mixture of old and new histone proteins. Euchromatin is associated with the centromere and telomere regions. Heterochromatin are regions of active transcription.Which region of chromatin is transcriptionally silent?a) Nucleoidb) Centromerec) Euchromatind) Heterochromatin
- . Which structure in the eukaryotic chromosome is about 700-840 nm in diameter, contains scaffold proteins, lamins, and topoisomerases, in addition to histone proteins, and is transcriptionally silent? the radial minibands the solenoid the nucleosome naked DNA the euchromatinWhich one of the following statements about nucleosomes is false? a) The DNA double helix wraps around the nucleosome. b) The sequence of amino acid in a histone tail is altered during chromatin remodeling. c) A nucleosome is composed of 8 histone proteins; two copies of each type of histone. d) A large percent of the nucleosome is positively charged.Which structure in the eukaryotic chromosome is about 11 nm in diameter, contains 8 histone proteins and a short region of double-stranded DNA, and is easily accessible to transcription? the heterochromatin the supersolenoid the radial minibands the solenoid the nucleosome
- If a section of a chromosome is heavily methylated, which of the following is likely to be true? Group of answer choices That portion of the chromosome is transcriptionally active That portion of the chromosome consists of euchromatin That portion of the chromosome is transcriptionally quiet RNA polymerase will have easy access to the DNA in that region. Which structure in the eukaryotic chromosome is about 2 nm in diameter, contains no histone proteins associated with double-stranded DNA, and is easily accessible to transcription? the heterochromatin the nucleosome the solenoid the naked DNA the radial minibandsHeterochromatin and Euchromatin Have Which Different Histone modifications
- Which of the following statements is NOT true about chromatin architecture? A. The histone tails on heterochromatin are deacetylated B. Heterochromatin is heavily methylated C. Euchromatin is more likely to contain genes that are expressed at that time D. Euchromatin is heavily methylatedGive at least one example of a chromosomal structureor function affected by the following mechanisms formodulating chromatin structure:a. Posttranslational changes of the normal histonesfound in the nucleosomeLoosening the chromatin structure occurs because of Select one: a. Lysine methylation b. Lysine acetylation c. Lysine phosphorylation d. Lysine sumoylation