Are there more true codes found in biology besides the central dogma?
DNA is a code that occurs via stepwise polymerization, like all major macromolecules. In respects to DNA, it is Nucleic Acid sequences that polymerize to create the DNA. In eukaryotic cells this happens at multiple replicons (regions of replication). So you can look DNA as code for itself. You also have rRNA, mRNA, and tRNA. All of these code for and do specific things. rRNA facilitates the creation and movement of the ribosome, where mRNA and tRNA "code" for the final protein. tRNA serves as the principle code strand for the correct Amino Acids. This is read as a series of three N.A's (codons) One codon for a respective Amino Acid. mRNA actually guides the synthesis of these polypeptide chains. You also have something called operons. These are groups of genes with related functions that are clustered together. This allows for rapid initiation and termination of gene expression. Im sure there are a few others but these are those that come off the top of my head. The term "code" and molecular bio are very much intertwined.