What IS DNA anyway? But First, Do Now: Find the table in your notes from two weeks ago. If you can’t find it, copy this one: Macromolecule Carbohydrate Protein Nucleic Acid Lipid Monomer Monosaccharide Amino acids Monomer structure 5-6 atom ring, 1:2:1 ratio of C:H:O Y – shape. 20 different types. 2 peptide bonds Types Mono-, di-, and poly- versions Structural proteins (i.e. hair)& enzymes Functions Store energy, cellulose in plant cell walls Many functions, i.e. digestion.

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

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

DNA & RNA Are Made Up of Nucleotides

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.

DNA stores important information RNA Processes and transfers information

DNA & RNA: The 2 types of Nucleic Acids Monomer Nucleotides # strands 2 1 Function Store Information Process Information

Macromolecule Analogy An analogy demonstrates a relationship between 2 things. Example: Cat is to fur as fish is to _____. The correct answer is scales, because fur is on the outside of a cat, and scales are on the outside of a fish. In an analogy, the relationship between the two words in each pair is the same

Macromolecules in Organisms are Like the Parts of a Computer Complete the table by identifying the macromolecules and computer parts that have the same functions. Function Macromolecule Computer Provide Energy Store Information Process Information Process things from input to output

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? Homework: Read p. 59 “Nucleic Acids”