DNA

A code written in pairs

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• A pairs with T (2 H-bonds), G with C (3 H-bonds).
• Each strand templates the other.
• Chargaff: A = T and G = C.

Steps

1. Two strands, four letters
2. Write the partner strand
3. Count the hydrogen bonds
4. Chargaff’s rule
5. Melting DNA
6. Turn up the heat