| A | B |
|---|
| element | A type of matter in which all the atoms are the same; cannot be broken down into simpler substances. |
| atom | The smallest unit of an element. |
| compound | Two or more elements that are chemically combined. |
| molecule | The smallest unit of most compounds. |
| organic compound | A compound that contains carbon |
| inorganic compound | A compound that does not contain carbon. |
| proteins | Large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur; they are needed for tissue growth and repair and play a part in chemical reactions within cells. |
| amino acids | Small units that are linked together chemically to form large protein molecules. |
| enzyme | A protein that speeds up chemical reactions in the bodies of living things. |
| carbohydrates | Energy-rich organic compounds, such as sugars and starches, that are made of the elements carbon, hydrogen, and oxygen. |
| lipids | Energy-rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen. |
| nucleic acid | A very large organic molecule made of carbon, oxygen, hydrogen, nitrogen, and phosphorus, that contains instructions that cells need to carry out all the functions of life. |
| DNA | Deoxyribonucleic acid; the genetic material that carries information about an organism and is passed from parent to offspring. |
| RNA | Ribonucleic acid; a nucleic acid that plays an important role in the production of proteins. |
