38. Which of the following statements about messengers RNA (mRNAs) and micro-RNAs (miRNAs) is/areCORRECT?
(A) Manyn mRNA are transpothat bind localization sequences usually found in the 3' untranslated region (UTR).
(B) Nonsense-mediated decay and other mRNA surveillance mechanisms prevent the translation of mRNAwith pre-existing, high amou unt of protein otein production.
(C) Both miRNAs and short interfering RNAS (siRNAs) contain 21-23 nuclcotides and are assembled into amultiprotein RNA-induced silencing complex.
(D)Approximately 1900 diferent human miRNAs have been observed, and most of them are expressed onlyin specific cell types at particular times during embryogenesis and after birth.
(E) Translation of mRNA can be repressed by miRNAs which form imperfect hybrids with sequence in thegenesis and after birth.3'UTR of specific target mRNAs.