Respuesta :

Chromatin: Substance made up of DNA and proteins. Codons: Sequence of three nucleotide bases on mRNA that codes for a specific amino acid. ... DNA: A double-stranded nucleic acid that contains the genetic information for cell growth, division, and function.
There are actually 4 roles of DNA

Replication 
Encoding information 
Mutation and Recombination 
Gene Expression 

Hope I helped! ( Smiles )