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This is a large site having sections on DNA, genetics, heredity, and cells.  There are interactives, paper and pencil activities, animations, and much more.

This site has some excellent resources for high school biology students. There are tutorials for several areas to reinforce classroom teaching. Students can practice on their own making DNA molecules and transcribing and transating DNA and RNA strands, creating their own karyotypes, and more. The interactive features on the site are great nonlinguistic tools for students who are struggling or need practice with biology basics.

This rather large (112 pages) .pdf is a unit on cells that also serves as a very good introduction to the microscope.  It compares well to similar AIMS units.

The whole Cells Alive site looks pretty good, if you teach about cells.  This section has interactive cell models that allow students to practice and review identifying organelles and other cell structures.

Using Quia, you can create your own or use other teacher's activities to provide students extra practice and extended learning time! There are activities in all subjects and levels and you can browse by category, activity type, or most popular activities. I found numerous Java games that were created to reinforce music skills. For example, my students could use the site to study for our upcoming terms, signs, and symbols quiz. There were free, online flashcards, matching, concentration, and word search games that reviewed all the terms I've been teaching. You can share all activities you create with other teachers and you can copy and modify other teacher's activities and contact them if you have a question. If you create a quiz in Quia, it will automatically grade it for you and track student's test scores throughout the year. You can also track how long a student spends on Quia activities. The site offers online surveys, activities in 100 languages and a calendar feature for communicating deadlines and assignments to students and parents.

This site has pretty much anything you could want to help students practice or review content. I checked out the math, biology, and art sections and found literally all kinds of interactive games, flashcards, and quizzes on a variety of topics. The site is very easy to use and find the topic you need; the search function allows you to search by category or textbook. If you make an account, you are able to create your own activities and quizzes and also view your students' results for the activities they have completed. I will definitely come back here.