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T. G. A. Histone octomer. C. G C. T A. Histone proteins. G C. C G. T A. A T. A T. C G. 2 nm. G C. T A. Packaging DNA. B DNA Helix. Histone proteins. 2 nm. Packaging DNA. T. G. A. Histone octomer. C. G C. T A. G C. C G. T A. A T. A T. C G. B DNA Helix. G C.

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  1. T G A Histone octomer C GC TA Histone proteins GC CG TA AT AT CG 2 nm GC TA Packaging DNA B DNA Helix

  2. Histone proteins 2 nm Packaging DNA T G A Histone octomer C GC TA GC CG TA AT AT CG B DNA Helix GC TA

  3. 11 nm Histone proteins Nucleosome 2 nm Packaging DNA T G A Histone octomer C GC TA GC CG TA AT AT CG B DNA Helix GC TA

  4. GC CG TA AT AT CG GC TA Packaging DNA

  5. GC CG TA AT AT CG GC TA Packaging DNA

  6. 11 nm GC CG TA AT 30 nm 200 nm AT CG GC TA Protein scaffold Packaging DNA “Beads on a string” Looped Domains Tight helical fiber

  7. 11 nm Nucleosomes 30 nm 700 nm 200 nm T Looped Domains Tight helical fiber G C A 2 nm Protein scaffold B DNA Helix Packaging DNA Metaphase Chromosome

  8. A packaged chromosome Chromatid Identical chromatid Replication Anaphase Chromosomes, Chromatids and Centromeres Chromosome arm Two identical chromosomes Centromere Chromosome arm

  9. Histone proteins Packaging DNA T G A Histone octomer C G C TA G C C G T A A T A T C G B DNA Helix G C T A

  10. GC CG TA AT AT CG GC TA Protein scaffold “Beads on a string” Looped Domains Tight helical fiber

  11. Nucleosomes T Looped Domains Tight helical fiber G C A Protein scaffold B DNA Helix Metaphase Chromosome

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