links and animations
Interactive flash cards exercise - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter14/flashcards.html
Base pairing practice activity - http://learn.genetics.utah.edu/content/molecules/builddna/
DNA structure summary animation - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter14/dna_structure.html
DNA replication summary animation - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter14/dna_replication.html
Realistic DNA replication animation - http://www.hhmi.org/biointeractive/dna-replication-advanced-detail
Base pairing practice activity - http://learn.genetics.utah.edu/content/molecules/builddna/
DNA structure summary animation - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter14/dna_structure.html
DNA replication summary animation - http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter14/dna_replication.html
Realistic DNA replication animation - http://www.hhmi.org/biointeractive/dna-replication-advanced-detail