| A | B |
|---|
| element | a substance that cannot be broken down into simpler substances |
| atom | 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 | compound that does not contain carbon |
| carbohydrate | Energy-rich compounds such as sugars and starches |
| protein | an organic molecule made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur |
| amino acid | small molecules that form proteins |
| enzyme | a protein that speeds up a chemcial reaction in living things |
| lipid | an organic compound such as fats, oils, and waxes |
| nucleic acid | a very large organic compound that contains instructions that cells need to carry out all the functions of life |
| DNA | the genetic material that is passed from parent to offspring |
| RNA | a nucleic acide that plays an important role in producing proteins |
