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PBS
Nova Online: Life's Greatest Miracle
The miracle of life is featured in this wonderful series of short videos and journal entries. A variety of topics are covered in this well written, authoritative piece.
University of Arizona
University of Arizona: Puntas De Raiz De Cebolla Online
In this activity you will be able to classify and count the cells from the tip of an onion root into the appropriate phases of the cell cycle. You can use your count to predict the time a dividing cell spends in each phase.
Curated OER
Cell Biology: Online Onion Root Tips
Online mitosis activity offers the student the opportunity to identify, classify, calculate, and graph the phases of mitosis. Explanations of each phase, actual cells are displayed for classifing and gathering data in this comprehensive...