from http://science-class.net/archive/science-class/Biology/Microbiology.htm
These resources are generally appropriate for grades 5 - 9. In some cases they have been classified by grade level.
The groupings are general and somewhat arbitrary. As with anything in education; your milage may vary.
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Mostly for Teachers
Mostly for Students
Elementary - Middle School
Middle School
How do animal and plant cells work?
Under what conditions do cells gain or lose water?
Middle School - High School
What is the role of DNA and RNA in protein synthesis?
What kills germs?
How can microscopic protists and fungi be characterized?
For Teachers and Students
Middle School -High School
Microscopes & Cells (Edquest)
The Cell & Its Structures (Edquest)
Fluid Movement in Cells (Edquest)
Cell Specialization & Organization(Edquest)
Cells (The Open Door)