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(biology) the basic structural and functional unit of all organisms

Cell Theory

the theory that states that all living things are made up of cells, that cells are the basic units of organisms, that each cell in a multicellular organism has a specific job, and that cells come only from existing cells

Plasma Membrane

a special boundary that helps control what enters and leaves the cell


structures specialized to perform distinct processes within a cell such as protein synthesis and energy transformation.

Eukaryotic Cells

contain a nucleus and other organelles that are bound by membranes-also referred to as membrane-bound organelles.


a distinct central organelle or a large membrane-enclosed structure that contains the cell's genetic material in the form of DNA

Prokaryotic Cell

cell that does not have a nucleus or other membrane-bound organelles

Selective Permeability

a process in which a membrane allows some molecules or substances to pass through while keeping others out

Phospholipid Bilayer

plasma membrane layers composed of phospholipid molecules arranged with polar heads facing the outside and nonpolar tails facing the inside.

Transport Proteins

move needed substances and waste materials through plasma membrane and therefore contribute to the selective permeability of the plasma membrane.

Fluid Mosaic Model

a plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer


semifluid material inside the cell's plasma membrane.

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