2. How do the nitrogenous bases pair? ____ pairs with ____ ____ pairs with ____
 3. If a strand of DNA has 20% C, what percent will be G? ________
 4. If a strand of DNA has 35% A, what percent will be T? ________ 5. If a strand of DNA has 10% G, what percent will be T? 
 5. List three facts about the structure of DNA