text: genes produce instructions only for? a.regulating body processes b.making proteins c.builing body parts d.crea   making proteins...   each of the sequences of the nitrogen bases code for an amino acid (start studying codons and anticodons).. they come in series's of three.. for exampled.. adenine, gunanine, and thymine... code for a specific amino acid... and as you should know.. when amino acids are "strung" together.. they make protiens.