上游充通大学 OUTLINES SHANGHAI JIAO TONG UNIVERSITY 1.A Nucleic Acid Consists of Four Kinds of Bases Linked to a Sugar-Phosphate Backbone 2.A Pair of Nucleic Acid Chains with Complementary Sequences Can Form a Double- Helical Structure 3.DNA Is Replicated by Polymerases That Take Instructions from Templates1.A Nucleic Acid Consists of Four Kinds of Bases Linked to a Sugar-Phosphate Backbone 2.A Pair of Nucleic Acid Chains with Complementary Sequences Can Form a Double￾Helical Structure 3.DNA Is Replicated by Polymerases That Take Instructions from Templates OUTLINES