| A | B |
|---|
| carbohydrates | group of chemicals that include sugar, starches, and cellulose |
| lipids | group of chemicals that include fats, oils, waxes, phospholipids and steroids |
| proteins | large complex molecules of many smaller molecules called amino acids |
| nucleic acids | large complex molecules that contain hereditary, or genetic, information |
| elements | a substance that cannot be broken down by chemical process into simpler substances |
| compound | a substance made of two or more elements chemically combined in definite proportions |
| organic compound | generally associated with living things |
| enzyme | a protein catalyst that speeds up the chemical reaction within an organism |
| metabolism | the combination of all the chemical changes that take place in an organism |
| homeostasis | the tendency of an organism to maintain stable internal conditions |
| solution | a uniform mixture of two or more substances |
