| A | B |
|---|
| amino acid | The building block of proteins. |
| atom | Tiny units that make up living things. |
| carbohydrates | The main source of energy of living things. |
| catalyst | Speeds up of slows down a chemical reaction. |
| compound | Two or more elements chemically combined. |
| dissaccharide | A double sugar--two simple sugars combined chemically. |
| electron | A negatively charged particle found in an atom. |
| element | A substance made up entirely of one kind of atom. |
| enzyme | Large complex protein molecules that control the speed of chemical reactions. |
| fats | Lipids that are solid at room temperature. |
| fatty acids | Building blocks of lipids. |
| glucose | A common monosaccharide. |
| glycerol | A building block of lipids. |
| inorganic compound | A compound that does not contain both carbon and hydrogen. |
| ion | An atom that has gained or lost an electron. |
| lipid | Substances that contain the elements, carbon, hydrogen, and oxygen--the ratio of hydrogen to oxygen is greater than 2:1. |
| maltose | A double sugar molecule. |
| neutron | Found in the nucleus of an atom--has no electrical charge. |
| nucleic acid | Very large molecules made up of carbon, oxygen, nitrogen, and phosphorus. |
| nucleus | The center core of an atom--composed of neutrons and protons. |
| oils | Lipids that are liquid at room temperature. |
| organic compound | A compound that contains both carbon and hydrogen. |
| polysaccharide | Long chains of sugar molecules bonded together. |
| pH scale | Measures whether a solution is acid, basic or neutral. |
| protein | Substances made up of carbon, hydrogen, oxygen, and nitrogen and sometimes sulfur. |
| proton | A positively charged particle located in the nucleus of an atom. |
