RNA Polymerase (a) How long would it take for the E . coli...

RNA Polymerase (a) How long would it take for the $E .$ coli RNA polymerase to synthesize the primary transcript for the $E$. coli genes encoding the enzymes for lactose metabolism, the 5,300 bp lac operon (considered in Chapter 28 )? (b) How far along the DNA would the transcription "bubble" formed by RNA polymerase move in 10 seconds?

Key Concepts

Transcription Bubble

The transcription bubble is the locally unwound region of the DNA double helix created by RNA polymerase during transcription. Within this bubble, around 12-14 base pairs of DNA are separated to allow the enzyme access to the template strand. As RNA polymerase moves along the DNA, the transcription bubble travels with it, serving as the active site where nucleotide addition occurs.

RNA Polymerase

RNA Polymerase is the enzyme responsible for synthesizing RNA from a DNA template during the process of transcription. It binds to the promoter region of a gene and orchestrates the initiation, elongation, and termination of RNA synthesis, ensuring that the genetic code is accurately transcribed into messenger RNA, which can then be translated into proteins.

Transcription Elongation Rate

The transcription elongation rate refers to the speed at which RNA polymerase incorporates nucleotides into the growing RNA strand during the elongation phase. This rate is critical to determining how long it takes to synthesize a complete RNA transcript and is typically measured in nucleotides or base pairs per second. Understanding this rate is essential for estimating transcription times across different genes.

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