Strucutre of DNA Notes How does our skin go back to normal after a sunburn? Write down your thoughts in box 1 Whats the story behind our skin cells not staying red/tanned? In box 2, think of a question that would help explain how we get cells that are skin cells and not something else: Whats the story behind our skin cells not staying red/tanned? In box 2, think of a question that would help explain how we get cells that are skin cells and not something else: How do new skin cells replace old ones, and make it look like the sun burn was never there? What is found in all cells nucleus? How is this important to our skin cells or any other cells? Structure Double Helix 2 stranded spiral DnA Deoxyribonucleic Acid (DNA) Macromolecule Polymer Nucleic Acid NucleotidesMade up of Monomers Building Blocks - Nucleotides Each Nucleotide Composed of 3 Things: Draw each into your box labeled Nucleotide examples 1)Sugar = deoxyribose 2)Phosphate group, PO 4 3)Nitrogenous base one of four Backbone of DNA: Structure box Repeating/alternating sugar-phosphate bonded with covalent bonds: Strong to keep it together. S-P-S-P-S-P-S-P-S-P OR D-P-D-P-D-P-D-P-D-P Rungs of DNA: structure box Nitrogenous Base pairs bonded by weak hydrogen (H) bonds 4 Nitrogenous Bases in DNA: Write onto your paper Pyrimidines Thymine T Cytosine - C Purines Adenine A Guanine - G Complimentary Base Pair Rules: Under base pair rules, cut out and fit together.with correct number of H bonds A with T 2 H bonds G with C 3 H bonds (Purine with Pyrimidine) Bases attach to backbone at the sugar, covalent bonds From your model, now make your own model: On the back of your notes, cut out adenine, guanine and thymine. Then put the correct base pair together. Include how many hydrogen bonds would the base pair have. Use your notes to complete the 3-2-1: a short quiz On your DNA example: Add the correct bases for the second strand of DNA, along with the rest of the nucleotide After you are done, what do you notice about the second strand? Circle one nucleotide Draw brackets around the backbone of DNA (on each side) Next: Draw in the correct number of hydrogen bonds between each base pair. Highlight one covalent bond. Color code your bases: Adenine= Thymine= Guanine= Cytosine= Project: Making your own DNA model 1)First of all, on the left side, describe why this model is not a perfect model. 2)You will make a model: 3)It must have 15 bases per strand. 4)You must have a key. 5)The nucleotides must be correct. 6)You must have it the correct shape. 7)You have to include hydrogen and covalent bonds: 8)BE CREATIVE!!! PP SATS PP SGCS PP STAS backbone alternating sugar phosphate molecules rungs rungs nitrogenous base pairs H bonds