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Lecture 30 The structure of the eukaryotic chromosome. DNA/nucleus problem 5 Levels of folding of DNA. The nucleosome: 10 nm beaded string. DNA wound around a cluster of histone molecules Histone tails Linker DNA Nucleosome (10 nm diameter) Fig. 10-2a, p. 213 The 30 nm coiled-cool; the 300 nm looped scaffold. Supercoiling: heterochromatin and euchromatin. Pairs of homologous pairs in diploid organisms. Lecture 31 Cell cycle and mitosis Eukaryotic cell cycle Cell Division: karyokinesis, nuclear division, mitosis and cytokinesis. Fig. 10-8, p. 218 10 Fig. 10-9b, p. 219 Lecture 32 Regulation of the cell cycle Cdk cyclin Cyclin Cdk cyclin P Poly-ubiquitylation cyclin Proteasome Ubiquitin Proteasomal destruction of cyclin P Retinoblastoma. E2F Rb Cdk2-cyclin E P + DNA mRNA DNA polymerase S-phase The End.