Each core histone has a __________ _____ region called a _______ ____ that is formed by ____ alpha helices that are connected by __ loops.

structural motif

histone fold

three

two

Eukaryotic cells contain a variety of ATP-dependent _________ __________ complexes that use the energy from ATP hydrolysis to catalyze nucleosome sliding, making the DNA (available/not available) to other proteins in the cell.