35. The results of human genome project show that more than 98% of the human genomes are composed of non-coding DNA (ncDNA) which are never represented within the amino acid sequence of expressed proteins. Which description is incorrect? (A) About 20,000 human proteins have been annotated in databases, which is significantly larger than that of the fruit fly. (B) The extensive use of alternative pre-mRNA splicing in humans provides the ability to build a very large number of modular proteins. (C) Some ncDNAs contain genes for RNA molecules with important biological functions. (D) Transposable elements belong to ncDNAs, which account for at least 50% of the human genome. (E) Some ncDNAs contain intron, 5' UTR and 3'UTR.