A slight departure from the classic view of DNA showing that the molecule is not exactly a twisted ladder. Good image and explanation to go with it.

Two multiple-choice quizzes, one on the processes and types of biological molecules, the other on the structure and replication of DNA.

These class notes from a Microbiology course at Acadia University outline point mutations, frameshift mutations, mutagens, mutation rate, and mutant isolation. A good way to review already learned concepts.

A 3D computer generated model of humans DNA structure. The double helix image labels base pairs, diameter, major and minor grooves.