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cell theory
1) All living things are made up of 1 or more cells
2) the cell is the smallest unit of life
3) all new cells come from pre-existing cells
Schleiden, Schwann, Virchow
Scientist who developed cell theory
Water
Main ingredient in a cell. 70% of a cell's volume.
macromolecules
large molecule that forms when smaller molecules form together
nucleic acid
long chains of nucleotides joined together. DNA and RNA are examples
Proteins
long chains of amino acid molecules.
Lipids
large macromolecule that does not desolve in water. Form a cell's protective barrier. cholesterol is an example
Carbohydrates
one or more sugar molecules. Store energy, provide structure, and communications
cell membrane
flexible covering that protects the inside of the cell from the environment outside a cell
cell wall
a stiff structure outside the cell membrane
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