In transcription, (Multiple Choice)

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

Question 2

The portion of the DNA molecule that is not translated and is a noncoding portion of DNA is
  composed of
  a. introns.
  b. anticodons.
  c. exons.
  d. transcriptions.
  e. regulatory proteins