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14-Unit4_Chromatin_transcription_Oct7_post.pptx

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Welcome to Biology 200 Section 101 Dr. Marcia Graves MWF 10-10:50 Wesbrook 100 1 Unit 3: Nuclei and Chromatin Three topics: 1. The interphase nucleus 2. Nucleic acids review (self-study) 3. Chromatin and chromosomes 2 1. Naked DNA (2nm) Levels of DNA packing in the nucleus 2. Nucleosomes (10-11nm) 3. Chromatin (30nm) Levels of DNA packing in the nucleus 3. Chromatin (30nm) Fig. 5-21 ã A chain of nucleosomes can be arranged in a 30 nm fiber ã formation of the 30nm fiber
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  Welcome to Biology 200 Section 101 Dr. Marcia Graves MWF 10-10:50 Wesbrook 100 1  Unit 3: Nuclei and Chromatin Three topics: 1.The interphase nucleus 2.Nucleic acids review (self-study) 3.Chromatin and chromosomes 2  1. Naked DNA (2nm) Levels of DNA packing in the nucleus 2. Nucleosomes (10-11nm) 3. Chromatin (30nm)  Levels of DNA packing in the nucleus 3. Chromatin (30nm) Fig. 5-21 ã A chain of nucleosomes can be arranged in a 30 nm fiber ã formation of the 30nm fiber is dependent on the presence of the H1 histone. ã H1 pulls nucleosomes together to form a regular repeating array of stacked nucleosomes ã There are competing ideas about how the 30nm is arranged This is the level of packing found in the interphase nucleus
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