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4/24/2017 --/ //-/ -/ - / -- / /- / / - /---/- - / -/-/ /- How does DNA copy itself? • Replication: when DNA is copied • Only known molecule to be able to duplicate itself • Basic: unzips itself, find complementary base pairs What does this have to do with science? • DNA: big deal, it looks cool But why do I have blue eyes? Type AB blood? A widow’s peak? <insert trait here>? • What’s the code for DNA? DNA > RNA > amino acids > Proteins 1 4/24/2017 • Transcription: a section of the DNA is copied into RNA – Think of DNA as the entire cookbook, and RNA like a recipe out of that book • Translation: putting together amino acids in the right order to make proteins – This is done on ribosomes – Think using the recipe to make tacos • 3 Bases code for one amino acid Let’s watch Base Pair to traits: • Ribosome – Organelle where protein synthesis takes place – “protein factory” • DNA traits – DNA codes for amino acids – Several amino acids make a protein – Proteins trigger chemical reactions • 3 base pairs code for an amino acid • There are 64 possible combinations • There are 22 amino acids DNA Tacos 3 base pairs (codon) Amino acid Amino acids make proteins Proteins are messengers for cells to do certain things What is he talking about? DNA Cookbook RNA Recipe Amino Acids Beef, cheese, lettuce, tomatoes, tortillas Proteins Taco 2 4/24/2017 What is the kitchen? Endoplasmic Reticulum What is the chef? Ribosomes 3