organelle - each part of a cell with a specific job to do (meaning "mini-organ")
plasma membrane - both kinds of cells have a thin outer covering
nucleus - houses the cell's genetic material in the form of DNA
cytoplasm - the entire region of the cell between the nucleus and the plasma membrane
cell wall - protects the plant cell and maintains its shape
prokaryotic cell - lacks a nuclus and most other organelles
eukaryotic cell - has a nuclus surrounded by its own membrane, and has other internal organelles bounded by membranes
diffusion - the net movement of the particles of a substance from where they are more concentrated to where they are less concentrated
equilibrium - something in balance
selectively permeable membrane - allows some substances to cross the membrane more easily than others and blocks the passage of some substances altogether
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