| A | B |
|---|
| carbohydrate | one or more sugar molecules |
| cell theory | living things are made of one or more cells; the cell is the smallest unit of life; new cells come from preexisting cells |
| lipid | large macromolecule that does not dissolve in water |
| macromolecule | substance that forms by joining many small molecules |
| nucleic acid | macromolecule that forms when a long chain of nucleotides join together |
| protein | long chain of amino acid molecules |
| theory | explanation based on scientific knowledge resulting from several observations and experiments |
| cell membrane | protects the inside of a cell from the environmen |
| cell wall | stiff structure outside the cell membrane |
| chloroplast | membrane-bound organelle that uses light energy and makes food |
| cytoplasm | fluid inside a cell that contains salts and other molecules |
| cytoskeleton | network of threadlike proteins inside a cell |
| envelope | outer covering |
| function | purpose for which something is used |
| nucleus | directs all cell activities and contains DNA |
| organelle | membrane-bound cell structure with a specialized function |
