This lesson plan explores the structure and function of DNA through building a 3D model and extracting DNA from cheek cells. Students first create a DNA model using candy and toothpicks to represent nucleotides and base pairing. Next, they purify DNA from their own cheek cells using a kit. The extraction involves breaking open cells, precipitating DNA with alcohol and salt, and visualizing the extracted DNA. The lesson aims to give students hands-on experience visualizing key characteristics of DNA.