DNA Builder: 3D Double Helix

DNA Builder lets students build a DNA molecule in 3D, base by base. What students can do: add nucleotides and pair adenine with thymine and cytosine with guanine, and watch the strand twist into a double helix. How to use it in class: to introduce DNA structure and base pairing, or for revision before genetics topics. Level: high school and introductory college biology. Free, works on computers, tablets and phones, no sign-up or download. Link: https://sciencedemy.com/biology/dna-builder/