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Nucleic Acids • Nucleic acids provide the directions for building proteins. • Two main types… DNA – deoxyribonucleic acid Genetic material (genes) that are passed on from parent to offspring Codes the amino acids sequence to create a protein RNA – ribonucleic acid Helps translate the genetic code to make proteins • • Nucleic acids are polymers made from the monomers called nucleotides 3 parts of a nucleotide – 1. 2. 3. Sugar (either deoxyribose or ribose) Phosphate group (phosphorus atom bonded to oxygen atoms) Nitrogenous base DNA bases Adenine, Guanine, Cytosine, Thymine RNA bases Adenine, Guanine, Cytosine, Uracil NUCLEOTIDES DNA Strands • DNA is many nucleotides chemically bonded in a specific sequence into a polymer by using dehydration synthesis. • DNA is composed of two strands wrapped around each other in a Double helix. • In the center of the helix, the nucleotide bases are held together by hydrogen bonds. • This base-pairing is specific – Adenine bonds with Thymine – Guanine bonds with Cytosine DNA Replication Before a cell can divide the DNA must copy itself in DNA Replication. It uses a semi-conservative model by having each strand used as a template for the new strand. This ensures that the DNA of the offspring is identical to the parent. Evolutionary Link DNA and Protein