A chromatin is the material that makes up both mitotic and inter phase chromosomes; a complex of proteins and DNA strands that are loosely coiled such that translation and transcription can occur.
The chromatain have four major functions. They package DNA into a smaller volume to fit in the cell. They strengthen the DNA to allow mitosis, and they prevent damage to DNA. Chromatain control gene expression and DNA replication.
Nerves are like trees. The have branches call axons.