Nucleotides are typically referred to by the name of their base. DNA exists as a pair of strands, wound around one another into a double helix, with the bases directed into the center. The structure and charges of the bases dictate that A on one strand can match only up with T on the other, and C only with G. This complementarity provides the basis for faithful replication of the entire DNA molecule.
Genes Code for Protein and Rna
While all genes are made of DNA, not all stretches of DNA act as genes. Indeed, in eukaryotic organisms, most of the DNA does not function as genes, meaning it is not the code for making proteins or RNA. Some DNA outside of genes has a structural role, some are remnants of old genes thatnow are functionless, and much of it appears to be "junk," inserted and copied by viruslike sequences. Within a gene, usually only one side of the double helix actually codes for product; the other side is silent. Which side of the helix acts as code varies from gene to gene.
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