Operandi

Japanese: operon

… In prokaryotes, a group of genes for several functionally related proteins are often adjacent to each other on the DNA and are transcribed as a single mRNA molecule. This group of genes is called an operon, and the individual genes that make it up are called cistrons to distinguish them. Therefore, the number of types of mRNA molecules in prokaryotes is thought to be less than the number of genes. …

From [Genetic Information]

...The RNA chain extends from the 5' end to the 3' end, and synthesis stops with the intervention of protein transcription termination factors at the base sequence site on the DNA that commands the termination of transcription, and it separates from the DNA. In prokaryotes, several closely related genes are often transcribed as a single messenger RNA (abbreviated as mRNA), and this group of genes is called an operon, and each gene is called a cistron. The mRNA transcribed as an operon is also translated separately for each cistron at the stage of protein synthesis on the ribosome. ...

From [DNA]

...(1) Several genes with related functions are arranged adjacent to each other on the DNA, and their information expression occurs simultaneously and is transcribed as a single mRNA. This unit is called an operon. (2) There is a base sequence 5'-terminal to the base sequence corresponding to the amino acid sequence of a protein, which regulates its expression. ...

*Some of the terminology that mentions "operon" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　原核生物の場合，機能的に関連した数個のタンパク質の遺伝子群が，DNAの上で隣接して存在し，これらが1分子のmRNAとして転写されることが多い。この遺伝子群をオペロンoperonと呼び，それを構成する各遺伝子をシストロンcistronと呼んで区別する。したがって原核生物のmRNA分子の種類数は遺伝子の数よりは少ないと考えられる。…

【遺伝情報】より

…RNA鎖は5′末端から3′末端の方向へ伸長し，DNA上の転写終結を指令する塩基配列部位で，タンパク質性の転写終結因子の介在のもとに合成を停止し，DNAより離れていく。　原核生物の場合，関連の深い数個程度の遺伝子が，ひとつづきのメッセンジャーRNA(mRNAと略記)として転写されることが多いが，この遺伝子群のことをオペロンoperonと呼び，各遺伝子をシストロンcistronと呼ぶ。オペロン単位で転写されたmRNAも，リボソーム上でのタンパク質合成の段階では，各シストロン別に翻訳される。…