| Term | Definition |
| Transcriptional Control | Chem. Mod. of DNA influences acccess to genes. |
| Transcript Processing Control | Pre - mRNA spliced in diff. ways. Different Proteins produced. |
| mRNA transport control | Transport Protein Binding determines whether mRNA will be delivered to cytoplasm for translation. |
| mRNA degradation control | Proteins attached to mRNA and length of poly-A tail determine how long mRNA lasts. |
| Translational control | inactivation of initiation factors. Proteins bind to mRNA. Ribosome cannot bind to mRNA. |
| Protein Product Control | Inactivation of new protein. Control of enzymes and other proteins influences many cell activites. |
| Promoter | Short stretch of base sequences in DNA where regulatory proteins gather and control transcription of specific genes. |
| Operator | Binding site for regulatory protein "repressor" which prevents transcription. |
| Operon | Arrangement in which a promoter and a set of operators control access to more than one prokaryotic gene. |