A selective, comprehensive collection, DMOZ presents a valuable collection of resources, covering amino acids, mutation, sea ice ecology, bacteria, viruses, unicellular algae, mammals, polar bears, reindeer, fox, and whales. Also links to a Biology Glossary and an Ecology Dictionary.

These video tutorials cover topics seen in a first year college or high school biology course, including Cellular and molecular biology,Human biology, Heredity and evolution, and Ecology.

Provides links to dozens of U.S. government image repositories for agriculture, astronomy and aeronautics, biology, conservation, earth sciences and geology, energy, engineering, health science and medicine.

Includes links to valuable resources and tutorials for molecular biology, genetics, mendelian inheritance in men, proteins, the cancer genome, and much more.

Published by the American Society for Cell Biology, the website offers abstracts from 1992–1997 and full-text articles from 1997–present. Access to tables of contents and abstracts is free; access to full journal content requires a subscription.

This webpage contains a collection of online biomedical books that can be searched directly by keywords or concepts.

Topics include genetics, blood types, color blindness, human genetics, mapping chromosomes, genetic disorders, DNA forensics, human reproduction, STDs, and the human heart.

This "Libguide" offers a good collection of biology reference sites on the Internet.