上游充通大兽 1 A Nucleic Acid Consists of 4 Kinds of Bases SHANGHAI JIAO TONG UNIVERSITY Linked to a Sugar-Phosphate Backbone 核酸链的组成： 磷酸 核酸→ 核苷酸 戊糖 核苷 碱基 遗传密码 Basei Basei+1 Basei+2 阝-糖苷键 ●● Sugar Sugar Sugar Sugar Sugar Phosphate Phosphate Phosphate Phosphate Phosphate 磷酸二酯键1 A Nucleic Acid Consists of 4 Kinds of Bases Linked to a Sugar-Phosphate Backbone 磷酸二酯键 b -糖苷键 核酸链的组成： 遗传密码 核 酸 核苷酸 磷 酸 核 苷 戊 糖 碱 基