(b) Histones are proteins that are present in nucleus in association with DNA
Histones are a set of positively charged, basic proteins found in eukaryotic cell nuclei that package and order the DNA into structural units called nucleosomes.
A protein acquires charge depending upon the abundance of amino acids residues with charged side chains.
Histones are rich in the basic amino acid residues lysines and arginines. Both the amino acid residues carry positive charges in their side chains.
Histones are organized to form a unit of eight molecules called Histone octamer.
