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Three stages of mitosis in a human cell; chromosomes are stained blue.
@ Laura Trinkle-Mulcahy, Wellcome Images. CC-BY-NC-ND 4.0

Prokaryotic and eukaryotic cells, mitosis, meiosis, cell cycle, membranes, organization and substructures

  • Cloning


    Who hasn't heard of "Dolly the Sheep?" So, what is cloning? Joseph G. Marx, PhD, provides answers these and other questions.

  • Stem Cells

    Stem CellsPresentation

    Learn about the different kinds and functions of stem cells, and about the medical possibilities and controversies surrounding stem cell research.