GIZMO: Building DNA 1. Look at the DNA molecule shown to the right. a twisted ladder What does it look like? 2. Based on this picture, how do you think a DNA it splits and untwists molecule makes a copy of itself? 3. What are the two DNA components shown in nucleoside and phosphate the Gizmo? 4. How many different nitrogenous bases do you 4 (Adenine, Cytosine, see? Guanine, and Thymine) 5. What makes up the sides of the DNA molecule? phosphates and sugar 6. What makes up the rungs of the DNA molecule? nitrogenous bases 7. Adenine joins to Thymine 8. Cytosine joins to Guanine 9. Thymine joins to Adenine 10. Guanine joins to Cytosine 11. An eznyme is a protein that facilitates cerIt splits it in half tain cell processes. Click release enzyme to release DNA helicase. What does this enzyme do to the DNA molecule? 12. What are the three parts of a nucleotide? phosphate, sugar and nitrogenous base 13. Why is DNA replication such a important process? Because a cell cannotgrow and reproduce (or divide) unless DNA has been replicated. 14. chromatin 1/2