Biology
Advanced Placement Digital Library-Biology APDL is a collection of Internet resources that have been reviewed for their educational merit in an AP* or Pre-AP* 

Amphibia Web - data on amphibians with over 139 species included.

Biodiversity and Conservation - a hypertext book which presents "the origin, nature and value of biological diversity, the threats to its continued existence, and approaches to preserving what is left."

BiologyBrowser - Thomson Biology Browser is a free database of biology resources and web links.BioNetbook - over 4,500 web pages searchable by type, organism, or country.

Bio Tech - an interactive educational resource and biotechnology reference tool

Brooks/Cole Biology Resource Center - information on textbooks, tutorials, quizzes, Internet Resources, recent developments in life sciences. Internet resource links are extensive and comprehensive.

Cells and Molecular Biology Online - general resource for online information in biology, including educational resources, publications, research, career opportunities, methods/protocals and professional societies.

Dictionary of Cell Biology - over 5,000 terms in searchable database.

EcoPort - 'Access Portal to Ecological Knowledge" from the University of Florida.

Entomology Index of Internet Resources - Internet directory of online insect related sources.

Environmental Contaminants Encyclopedia - ecotoxicology resources. 

Genetics Home Reference provides consumer-friendly information about the effects of genetic variations on human health.
Internet Biodiversity Service - "This Internet Biodiversity Service gives you access to information about biological systematics, ecology and evolution and enables you to analyse your selections." 

National Biological Information Infrastructure - "The NBII is an electronic gateway to biological data and information maintained by federal, state, and local government agencies; private sector organizations; and other partners around the nation and the world." 

Neuroethics - Offers briefings, pointers to the literature, and other information on ethical issues in neuroscience

USGS Biological Resources Discipline  Aims to provide the scientific understanding and technologies needed to support the sound management and conservation of United States biological resources

National Center for Biotechnology Information - database and information on genetic research. 

National Reference Center for Bioethics Literature (NRCBL) - is a specialized collection of books, journals, newspaper articles, legal materials, regulations, codes, government publications, and other relevant documents concerned with issues in biomedical and professional ethics.

NCBI Taxonomy Homepage

NDB Biological Structure Resource - includes the Nucleic Acid Database, the searchable Structure Finder, À La Mode, the database for monomer units and ligands, plus the mmCIF (macromolecular Crystallographic Information File). 

Southwest Biotechnology Information Facility - over 3,500 links to biotechnology resources.

Tree of Life - collection of web pages about groups of organisms linked to form an evolutionary tree.

Visible Human Project - 3-D representations of the male and female human body.

WWW Virtual Library - Biosciences & Molecular Biology (Biosciences)

Yahoo Biochemistry

Yahoo Molecular Biology