| __ | 1. | Active site | | A. | Organic molecules that are often enzyme cofactors |
| __ | 2. | ATP | | B. | Substance that is sometimes needed to complete an enzyme |
| __ | 3. | ATPase | | C. | The portion of an enzyme where catalytic activity occurs |
| __ | 4. | Cofactor | | D. | Combination of an enzyme with the compound on which it acts |
| __ | 5. | Enzyme-substrate complex | | E. | Bonds that release a lot of enegy when they are broken |
| __ | 6. | Enzymes | | F. | High Energy Molecules |
| __ | 7. | High-energy chemical bonds | | G. | Molecule that is acted upon by the enzyme |
| __ | 8. | Inhibitor | | H. | Special proteins that affect the rate of chemical reactions |
| __ | 9. | Substrate | | I. | Substance that decreases the activity of an enzyme |
| __ | 10. | Vitamins | | J. | Enzyme that hydrolyzes ATP into ADP, releasing energy |