In the cytoplasm, mRNA is translated to make proteins. A ribosome finds a start codon on the mRNA. Codons are made of three bases which represent an amino acid, and a series of amino acids makes a protein.
Single-stranded RNA binds with the bases of the split DNA. Uncoded segments of the RNA called introns are removed. Messenger RNA leaves the nucleus for the cytoplasm carrying copied genetic information.
DNA provides the instructions for production of proteins. Watson and Crick discovered the copying mechanism in which the double helix splits apart, separating the nitrogenous base pairs. Each nitrogenous base then creates a copy of its pair.