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DNA Double Helix

Base pairs in 3D

A rotating double helix with color-coded A–T and G–C base pairs and a sugar–phosphate backbone.

Scored investigation

Playing with a simulation is not the same as earning a point. These take your own measurements from this lab into a real AP free response, graded against the rubric.

Use the helix model to explain base pairing and strand direction

Unit 2 · Cell structure and function · Model reasoning · 6 pts

Booting the lab…