Why does controlling transcription affect prokaryotic gene expression?

However, a lot of gene regulation occurs at the level of transcription. Bacteria have specific regulatory molecules that control whether a particular gene will be transcribed into mRNA. Often, these molecules act by binding to DNA near the gene and helping or blocking the transcription enzyme, RNA polymerase.

Explanation:

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several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.