The discovery of many noncoding RNAs is causing scientists to revise the long-held view that __________.

• A. all genes code for proteins
• B. there are only three types of RNA—tRNA, rRNA, and mRNA
• C. the vast majority of the human genome consists of "junk" DNA
• D. only DNA that codes for protein, tRNA, and rRNA is transcribed
• E. All of the listed responses are correct.