(8)Replication origin(s)in prokaryotic and eukaryotic cells(10 min) (9)Proteins participating in DNA replication(15 min) (10)Telomere and telomerase(10 min) Lecture 3: (11)Types of DNA mutations(15 min) (12)Causes of DNA mutations(10 min) (13)DNA repair systems(25 min) 三、教学重点与难点 1.教学重点 (1)DNA structure:first order,second order,and third order (2)Mechanism and characteristic of DNA replication (3)Types of DNA mutations (4)Mechanism of DNA repair 2.教学难点 (1)Proofreading mechanism of DNA replication (2)Different DNA repair systems 四、教学方法选择(8) Replication origin(s) in prokaryotic and eukaryotic cells (10 min) (9) Proteins participating in DNA replication (15 min) (10) Telomere and telomerase (10 min) Lecture 3: (11) Types of DNA mutations (15 min) (12) Causes of DNA mutations (10 min) (13) DNA repair systems (25 min) 三、教学重点与难点 1．教学重点 (1) DNA structure: first order, second order, and third order (2) Mechanism and characteristic of DNA replication (3) Types of DNA mutations (4) Mechanism of DNA repair 2. 教学难点 (1) Proofreading mechanism of DNA replication (2) Different DNA repair systems 四、教学方法选择