| A | B |
|---|
| codon | A "word" in genetic code that is made of three nucleotides. |
| start codon | A genetic code that signals the start point of an amino acid of translation. |
| promoter | A DNA segment that allows a region of DNA to be transcribed by helping the RNA polymerase to find the place where a gene starts. |
| operon | A region of DNA that contains a promoter, an operator, and one or more genes that code for all the proteins necessary for a particular task. |
| exons | A segment of mRNA that codes for a protein. |
| introns | A segment of mRNA that does not code for a protein. |
| anticodon | The complementary base pairing to a mRNA codon. |
| stop codon | A genetic code that signals the end, or stopping point, of an amino acid chain during translation. |
