Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS

NOVA Online (see text links below)
Cancer Warrior
How Cancer Grows
2. Mutation of DNA
Previous page | Next page

DNA mutation

Here is the same section of DNA but from another cell. If you can imagine that DNA is a twisted ladder, then each rung of the ladder is a pair of joined molecules, or a base pair. With this section of DNA, one of the base pairs is different from the original.

This DNA has suffered a mutation, either through mis-copying (when its parent cell divided), or through the damaging effects of exposure to radiation or a chemical carcinogen.

Previous page | Next page

1. DNA of a normal cell | 2. Mutation of DNA | 3. Genetically altered cell | 4. Spread and second mutation | 5. Third mutation | 6. Fourth mutation | 7. Breaking through the membrane | 8. Angiogenesis | 9. Invasion and dispersal | 10. Tumor cells travel | 11. Metastasis


Dr. Folkman Speaks | Cancer Caught on Video
Designing Clinical Trials | Accidental Discoveries | How Cancer Grows
Help/Resources | Transcript | Site Map | Cancer Warrior Home

Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule
About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print
PBS Online | NOVA Online | WGBH

© | Updated February 2001

Support provided by

For new content
visit the redesigned
NOVA site

Feedback Shop Site Map Search Home Text Version Cancer Warrior Home