When scientists analyzed the transcripts produced from a couple of human chromosomes, they found that about 10 times more DNA is transcribed than what would be predicted by the percentage of DNA sequences that code for polypeptides. This finding may best be explained by? 1) The presence of non-coding RNA molecules that are transcribed 2) Errors in the process of transcription 3) Mutations in the DNA sequences that code for polypeptides 4) Inaccurate predictions about the percentage of DNA sequences that code for polypeptides