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Honors Biology-Dr. Langdon
Framingham High School

email:  rlangdon@framingham.k12.ma.us
voicemail extension: 27627 (email preferred)
Course Guidelines in Word or PDF Format

Central Dogma:  DNA Structure & Function


  • Central Dogma Homework  Word | PDF 


  • Forensic PCR- crime-scene DNA analysis


Exam Preparation

Interesting Links


molecular model of DNA helicase

A molecular model of DNA Helicase.  An important enzyme in DNA replication, helicase binds to the ori, the origin of replication, and unzips the double helix.  The helicase ring forms around the DNA strand, with the DNA running through the hole in the center.