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cell theory

all living things are made of cells


organism whose cells contain nuclei


unicellular organism lacking a nucleus


main source of energy for the body


fats and oils


macromolecules that contain nitrogen as well as carbon, hydrogen, and oxygen

cell membrane

thin, flexible barrier around a cell; regulates what enters and leaves the cell


the property of being diffused or dispersed

active transport

the movement of materials through a cell membrane using energy


diffusion of water across a selectively permeable membrane


Tiny, free-floating organisms that occur in aquatic environments


used to see microscopic objects up close

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