What does X represent in the following diagra | vedclass

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(C) The diagram illustrates the process of transcription in prokaryotes. In prokaryotic transcription, the $RNA$ polymerase enzyme requires a specific

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$\Sigma$ factor

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(C) The diagram illustrates the process of transcription in prokaryotes. In prokaryotic transcription, the $RNA$ polymerase enzyme requires a specific initiation factor to bind to the promoter region of the $DNA$ template. This initiation factor is known as the $\Sigma$ $(\sigma)$ factor. Once the $\Sigma$ factor binds to the $RNA$ polymerase, it facilitates the recognition of the promoter site and initiates the transcription process. Therefore, $X$ represents the $\Sigma$ factor.

What does $X$ represent in the following diagram?

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