Access Excellence
You'll find a wealth of biology resources at this site for teachers and students from the National Health Museum including an activities exchange, science news, and a resource center with graphics and animations.
Intended Audience: Students/Teachers Reading Level: Middle/High School Teacher Section: Yes Searchable: No

Action Bioscience
This site from the American Institute of Biological Sciences features links and peer-reviewed articles on biodiversity, genomics, the environment, biotechnology, and evolution. You'll also find articles, lesson plans, and media for educators.
Intended Audience: General Reading Level: High School Teacher Section: Yes Searchable: Yes

BioEd Online
Looking for great teaching resources? Check out this site from Baylor College of Medicine. It features ready-to-go class lessons and units, online presentations and slide shows, and online workshops and courses. Way cool!
Intended Audience: Teachers Reading Level: N/A Teacher Section: N/A Searchable: No

BioInteractive
Have you ever wanted to diagnose cardiac disease or identify bacteria based on a DNA sequence? Well, check out this site from the Howard Hughes Medical Institute! You find interactive labs, online lectures, animations, video, classroom activities and loads more!
Intended Audience: Teachers/Students Reading Level: High School Teacher Section: Yes Searchable: Yes

Biology in Motion
Cartoon mini-lectures on intestinal gas and enzymes, an interactive do-it-yourself evolution lab, and a drag and drop cell division interactive are just a sampling of what you'll find at this site from biology teacher Leif Saul.
Intended Audience: Students Reading Level: Middle/High School Teacher Section: Yes Searchable: No

Nobel Museum
Read biographies of and interviews with Nobel Prize Laureates in physics, chemistry, medicine, literature, and peace. Make sure you check out the games section and try your luck and test your knowledge with games like Find the Author, The DNA Double Helix Game, Lord of the Flies, Blood Typing, Control of the Cell Cycle, and Pavlov's Dogs. The site also includes readings on DNA, semiconductors, and matter.
Intended Audience: General Reading Level: Middle/High School Teacher Section: No Searchable: Yes

Ology
Learn all about marine biology, genetics, biodiversity, paleontology, astronomy, and Einstein at this site from the American Museum of Natural History. You'll find loads of information, games, and activities.
Intended Audience: Students Reading Level: Elementary Teacher Section: Yes Searchable: No

The Biology Project
This interactive online resource for learning biology was developed at The University of Arizona and is intended for college students, but can also be helpful to middle and high school students. Teachers will find activities and lesson plans for pre-college students on the site.
Intended Audience: Students Reading Level: Middle/High School Teacher Section: Yes Searchable: No

BioDiac
Looking for an image of a chloroplast, Actinospaerium, or the stages in the evolution of the enclosed nephron in the chordates? Look no further! This site from the University of Ottawa has thousands of biology diagrams, drawings, photos, and videos.
Intended Audience: Students Reading Level: High School Teacher Section: No Searchable: Yes

Biology Browser
This site from Thomson Reuters features links to biology resources for researchers, librarians and students.
Intended Audience: General Reading Level: High School Teacher Section: No Searchable: Yes

BioZone
This site from Biozone International has hundreds of indexed links to biology resources.
Intended Audience: General Reading Level: Middle Teacher Section: No Searchable: Yes

The Biology Corner
This site from a high school biology teacher in Missouri is designed for for teachers and students and features links to biology lessons, web quests, images, and quizzes.
Intended Audience: Teachers/Students Reading Level: Middle/High School Teacher Section: N/A Searchable: No