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NAME:__________________________________ TOC #________ DNA Structure Worksheet Use your DNA structure notes and Chapter 17 to answer these questions 1. What do the letters DNA stand for? 2. DNA is a polymer, which means that is made up of many repeating single units (monomers). What are the monomers called? 3. The “backbone” of the DNA molecule is made up of two alternating components, what are these? 4. There are four different variations of these monomers (four different bases), what are the names of those bases? 5. These bases are of two different types of molecules: purines and pyrimidines. Purines have _______________________ ring(s) in their structure, and pyrimidines have _______________________ ring(s) in their structure. 6. The two bases that are purines are _____________________ and ________________________. These bases are comprised of ___________ rings. 7. The two bases that are pyrimidines _____________________ and ________________________. These bases are comprised of ___________ rings. 8. Based on this information, scientist could predict that the base _______________________ pairs with _______________________ and the base _______________________ pairs with _______________________ in the formation of the DNA molecule. This is called complementary base pairs. Thus one strand of DNA is complementary to the other strand (opposite/matching). 9. The bases are paired by _______________________ bonds along the axis of the molecule. NAME:__________________________________ 10. Draw the basic structure of a nucleotide with its three parts. 11. Write the complementary sequence to following DNA strand: 12. Use the image at the right to complete the follow: Circle a nucleotide. Label the sugar and phosphate. Label the bases that are not already labeled 13. On the Following Page, color the DNA structure. TOC #________ NAME:__________________________________ TOC #________ Step 1: Color Each Deoxyribose sugar RED Color Each Phosphate group BLUE Step 2: Step 3: Color the _____ hydrogen bonds between A and T BLACK Learve the ____ hydrogen bonds between G and C WHITE