microbiology
Cell Craft Flash game
This engaging strategy game leads players through the parts of the cell and their functions. Reading is required, and the topics covered are on a middle school and high school level. There is nothing about the game that is inappropriate for younger kids, except that it's probably too hard. Here's the description from the developer's website:
Ask a Scientist at the Howard Hughes Medical Institute
"Ask a scientist" welcomes questions about medicine, human biology, animals, biochemistry, microbiology, genetics, and evolution. There are links to their top ten questions, careers in science, and science fair project ideas as well.