<prompt> What is the function of a promoter site on DNA?Transcribes repressorInitiates transcriptionCodes for RNA polymeraseRegulates termination  <response>: Promoter sites are initiation sites for transcription. Transcription stas when RNA polymerase binds to the promoter. It then unwinds the closed promoter complex, where DNA is in the form of a double helix, to form the open promoter complex in which about 17 base pairs of template DNA are unwound. RNA synthesis then begins with either a pppA or a pppG inseed at the beginning 5-terminus of the new RNA chain, which is synthesized in the 5 to 3 direction. Ref: Weil P. 2011. Chapter 36. RNA Synthesis, Processing, Modification. In D.A. Bender, K.M. Botham, P.A. Weil, P.J. Kennelly, R.K. Murray, V.W. Rodwell Eds,Harpers Illustrated Biochemistry, 29e. 