試題詳解

複選題
38. Which of the following statements about messengers RNA (mRNAs) and micro-RNAs (miRNAs) is/are CORRECT?
(A) Manyn mRNA are transpo that bind localization sequences usually found in the 3' untranslated region (UTR).
(B) Nonsense-mediated decay and other mRNA surveillance mechanisms prevent the translation of mRNA with 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 a multiprotein RNA-induced silencing complex.
(D)Approximately 1900 diferent human miRNAs have been observed, and most of them are expressed only in 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 the genesis and after birth. 3'UTR of specific target mRNAs.