Organelle: part of cell with a specific function
Plasma membrane:Thin outer boundary of a cell that regulates the traffic of chemicals between the cell and it's surroundings.
Nucleus:It is an atom, the central core that contains protons and neutrons in a cell.
Cytoplasm:region of a cell between the nucleus and t he plasma membrane.
Cell wall:Strong wall outside a plant cell's plasma membrane that protects the cell and maintains it's shape.
Prokaryotic cell: Cell lacking a nucleus and most other organells.
Eukaryotic cell: Cell with a nucleus and other internal organells
Diffusion: net movement of the particles of a substance from where they are more concentrated to where they are less concentrated.
Equilibrium: point at which the number of diffusing molecules moving in one direction is equal to the number moving in the opposite direction.
electively permeable membrane: membrane that allows some substances to pass more easily than others and blocks the passage of some substances altogether.
