An assortment of resources on molecular biology can be found online. Here are some of the most useful sites:
The Biology Project: www.biology.arizona.edu/molecular_bio/molecular_bio.html
Molecular Biology Web Book: www.web-books.com/MoBio
Cell & Molecular Biology Online: www.cellbio.com
Molecular Biology Notebook: www.rothamsted.ac.uk/notebook/courses/guide
Your Genes, Your Health: www.ygyh.org
Wikipedia article: “Molecular biology”: en.wikipedia.org/wiki/Molecular_biology