複選題19.RNAi methodology uses double-stranded pieces of RNA to trigger breakdown of a specific mRNA or inhibit its translation. For which of the following might this technique be useful? (A) To destroy an unwanted allele in a homozygous individual. (B) To decrease the concentration of a desired protein in cells. (C)To form a knockout organism that will not pass the deleted sequence to (D) To decrease the production from a harmful mutated gene. (E) To modify a specific gene at the DNA levels.