This linker histone changes the path dna takes as it exits the nucleosome core allowing it to form a more condensed chromatin fiber: short region of dna double helix 2nm, beads on a string form of chromatin 11nm, chromatin fiber of packed nucleosomes 30nm, chromatin fiber folded into loops 700nm, entire mitotic chromosome 1400nm. Dna strand leaving a small gap on one strand of the dna double helix: repair dna polymerase binds to the 3" hydroxyl end of the cut dna strand then fills in the gap by making complimentary copy of the information stored in the undamaged strand, elongating the chain in the 5" 3" direction having the same proofreading activity to ensure accurate coping, when the repair dna polymerase has filled in the gap, a break remains in the sugar phosphate backbone of the repaired strand, this is sealed by dna ligase (same enzyme that joins okazaki fragments)