In Transcription

In transcription,

A) several amino acids are assembled by the messenger RNA molecules at one time.
B) a special sequence, called a promoter, is necessary for transcription to begin.
C) certain polypeptide sequences are governed by one ribosome, while other sequences are produced by other ribosomes.
D) the transfer RNA molecules arrange the messenger RNA codons into the appropriate sequence.
E) a special sequence, called an intron, is necessary for transcritpion to begin.