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What is the main role of the s(sigma) facotrs in the E. coli RNA polymerase complex?

hawkins1346

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What is the main role of the s(sigma) facotrs in the E. coli RNA polymerase complex?

What is the main role of the s(sigma) facotrs in the E. coli RNA polymerase complex?
a. They stabilize the polymerase.
b. They unwind the DNA ahead of the transcription complex.
c. They recognize promoter sequences on DNA.
d. They help chain elongation.
e. none of the above

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