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12 terms

cytology-study of cells-5

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cell theory
all living things are made of cells
eukaryote
organism whose cells contain nuclei
prokaryote
unicellular organism lacking a nucleus
carbohydrates
main source of energy for the body
lipids
fats and oils
proteins
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
diffusion
the property of being diffused or dispersed
active transport
the movement of materials through a cell membrane using energy
osmosis
diffusion of water across a selectively permeable membrane
plankton
Tiny, free-floating organisms that occur in aquatic environments
microscope
used to see microscopic objects up close