Elongation in prokaryotes
During elongation, the prokaryotic RNA polymerase tracks along the DNA template, synthesizes mRNA in the 5' to 3' direction, and unwinds and rewinds the DNA as it is read.
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http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@9.85:75
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