試卷名稱:115年 - [無官方正解]115 國立臺灣大學_ 碩士班招生考試試題:細胞與分子生物學#137645
年份:115年
科目:研究所、轉學考(插大)◆細胞與分子生物學
27. During pre-mRNA splicing, which molecular event directly generates the 2'-5' phosphodiester bond characteristic of the lariat intermediate?
(A) ATP-dependent helicase activity ofthe spliceosome.
(B) Nucleophilic attack by the 2'-OH ofthe branch-point adenosine on the 5' splice site.
(C) Cleavage ofthe 3' splice site by U2AF.
(D) Base pairing between U1 snRNA and the 5' splice site.
(E) Dephosphorylation of the 5' cap.