Engage your students in creating a 2-dimensional model of DNA (and extra-credit opportunity to create a 3-D version). I found that many of the DNA model projects with templates online or in textbooks were overly simplistic; because the pieces fit together, students could intuit how the pieces went together but not actually think deeply about the structure of DNA. In this project, I ask students to create a 2-D model using only paper and forming each piece as a different color. When I first designed this, I thought it would be easy for students to accomplish... each year, I am reminded of what a difficult, high-level task this is. In this project, I ask that students not only include nitrogenous bases, deoxyriboses, and phosphate groups, but also hydrogen bonds, covalent, labeling/counting carbons around deoxyriboses, showing an introductory level of 5' --> 3' conventions, and figuring out a way to show that the DNA is coiling into a helix. I use this with introductory biology, but gearing them up for AP Biology. I ask students to peer-review their models (and adding/editing any mistakes) before submitting and this has prompted good discussions about models and students supporting each other in their learning. Materials included in this download include: Word and PDF versions of the assignment, the peer review rubric, and the rubric I use when grading (smaller to save paper).