Molecular biology is the study of biological macromolecules at the structural and functional level, particularly DNA and proteins. There are many free resources on the Internet to study various aspects of these primary constituents. The following is a list of some of these web-based tools and a brief description with some verbiage used from the native site. This is not a comprehensive list, but it is meant to provide a good starting point for researchers. Some resources might be duplicated on some of the other lists.
Nucleic Acid Sequencing Tools
Protein Sequence Analysis Tools
3D Macromolecular Structure Tools
See also the Internet guides listed under General Biology (link below), many of which includes sections on cellular and molecular biology.