1. What IS DNA anyway? Do Now: 1.pass up the lab! 2.Read “why do enzymes have an optimal temperature” 3.Why do you think enzymes have an optimal pH also?

2. DNA’s Basic Structure isn’t Complex Just like polysaccharides are long chains of… And proteins are 1 or more long chains of … Nucleic Acids are long chains of… NUCLEOTIDES

3. Nucleotides: The Subunits of Nucleic Acids A, C, G, T, U

4. DNA & RNA Are Made Up of Nucleotides

5. Sugar – Phosphate Backbone Hydrogen bonds between base pairs hold the two strands together

7. This model animation shows approximately 40 nucleotides arranged in a double helix (2- stranded spiral.) DNA is a chemical that stores information. It’s like a hard drive. Computers store information as 1s and 0s. DNA and RNA store information as As, Ts, Gs, and Cs. Just like an iPod stores your favorite songs, DNA stores your species favorite biological instructions.

8. DNA stores important information RNA Processes and transfers information

9. DNA & RNA: The 2 types of Nucleic Acids DNARNA MonomerDNA Nucleotides (deoxyribose sugar) RNA Nucleotides (ribose sugar) # strands21 FunctionStore InformationProcess Information BasesA,T,G,CA,U,G,C

10. The sugars aren’t that different.

11. RNA Structure Because RNA molecules are single stranded, they can have a great variety of shapes and structures. These shapes are formed by the single stranded molecule hydrogen bonding to itself in different ways Self-replicating RNA molecules

12. Wrap Up: What are nucleic acids made of? What element do nucleotides have that other monomers don’t? What do nucleic acids do? What are the two types of nucleic acids? What holds the two strands of a DNA molecule together? What are some of the differences between DNA and RNA?