Define the following terms: $Cistron$ and $Terminator$.

(N/A) $Cistron$: It is a segment of $DNA$ that codes for a specific polypeptide chain. In eukaryotes,it is usually monocistronic,while in prokaryotes,it is often polycistronic.
$Terminator$: It is a specific sequence of $DNA$ that signals the end of transcription. When the $RNA$ polymerase enzyme reaches this region,it stops the synthesis of $RNA$ and releases the transcript.