Lesson 2: DNA Part 02
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Instead of doing flashcards (because I can't find any good ones), try to cartoon out the steps of the Meselson and Stahl experiment.
The McGraw Hill video on Meselson and Stahl is posted to youtube and is very beneficial. It visualizes how the centrifugation showed the weights of each strand of DNA.
Go into more depth on the Meselson and Stahl Experiment on Wikipedia.
Lesson 5: Polynucleotides (DNA/RNA) as Biological Polymers