50 DNA STRUCTURE

Some notes on basic DNA structure

Make sure you know the four bases
How they pair
What's in the backbone
What is a nucleotide
What is a double helix

And then familiarize yourself with the scientists most associated with the illumination of the structure of DNA, and its role in heredity.
Watson, Crick, Franklin, Chargaff, and Wilkins
http://youtu.be/LlR06-O3NzU

Here are the 5 papers most associated with the "discovery" of the structure of DNA
http://www.nature.com/nature/dna50/archive.html

And here is a series of interactive videos about DNA - you can actually see some of the scientists (or their associates) talking about the process...
http://www.dnai.org/a/index.html