How does histone acetylation change chromatin structure? Group of answer choices 1. Histones lose their positive charge so the negatively charged DNA is more tightly packed 2. Histones lose their positive charge so the negatively charged DNA is less tightly packed 3. Histones lose their negative charge so the positively charged DNA is more tightly packed 4. Histones lose their negative charge so the positively charged DNA is less tightly packed

How does histone acetylation change chromatin structure? Group of answer choices 1. Histones lose their positive charge so the negatively charged DNA is more tightly packed 2. Histones lose their positive charge so the negatively charged DNA is less tightly packed 3. Histones lose their negative charge so the positively charged DNA is more tightly packed 4. Histones lose their negative charge so the positively charged DNA is less tightly packed

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter16: Gene Expression

Section: Chapter Questions

Problem 2VCQ: Figure 16.7 In females, one of the two X chromosomes is inactivated during embryonic development...

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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.
Nucleosomes are the ball-like structures around which the double helix winds. What proteins make up nucleosomes? Group of answer choices hertone histone heterochromatin euchromatin
Which of the following statements about heterochromatin is FALSE? It contains many repeated sequences, but few actively transcribed genes. It remains condensed through most of the cell cycle. It is found next to the centromeres and on short arms in human chromosomes. It is enriched for transposable elments Histone proteins in heterochromatin are heavily acetylated, reducing their affinity for the DNA backbone.
Which histone helps stabilize the solenoid structure of eukaryotic chromatin? H4 H3 H2B H2A H1
Which 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.
Describe the mechanism by which histone modifications are established after DNA replication and cell division. What are some things that could go wrong if modifications can't be maintained? Think about what histone modifications do to DNA and why cells maintain parts of their chromosome as heterochromatin.
Figure 16.7 In females, one of the two X chromosomes is inactivated during embryonic development because of epigenetic changes to the chromatin. What impact do you think these changes would have on nucleosome packing?
In eukaryotic chromosomes, DNA wraps around _________. a. histone proteins c. centromeres b. sister chromatids d. nucleosomes
Genes are not always active in cells. The cell has evolved to edit its chromatin state in accord with the energy needs of the cell and organism. What are these two kinds of chromatin called and how does chromatin modeling work in cells? Name four of the known families of chromatin remodeling complexes enzyme complexes that act directly on DNA to alter nucleosome composition in transcribed regions.
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
Which of the following is associated with active chromatin? Check all that apply. A. Centromeres B. heterochromatin C. histone acetylation D. Polytene puffs E. metaphase chromasomes F. transcription of machinery
Which of the following statements most accurately represent chromatin state and transcription? Group of answer choices 1.Histone deacetylases promote closed chromatin and result in repressed transcription 2.Open chromatin is associated with hypoacetylation and has high levels of transcription 3.Histone acetyltransferases result in hypoacetylation and high levels of transcription 4.Hyperacetylation is associated with closed chromatin and low levels of transcription