Intron
参考答案:
是结构基因中的非编码序列,往往与编码序列呈间隔排列。
为γ-氨基丁酸的环状衍生物,可促进乙酰胆碱合成的改善脑功能药物是
A.盐酸多奈哌齐B.利斯的明C.吡拉西坦D.石杉碱甲E.氢溴酸加兰他敏
Questions 27~30
A. It has a tutorial supervision system. B. It has progressive ideas on education. C. Its professors are more interested in research. D. Its staff maintain a good relation with the students.