Enzymes speed up the chemical reactions by:
| 1. | Getting used up in the reaction |
| 2. | Formation of different products |
| 3. | Converting endothermic reactions to exothermic |
| 4. | Lowering activation energy |
The substrate concentration at which the enzyme catalyzed reaction achieves ½ Vmax is its ____ value.
| 1. | Km | 2. | Kcat |
| 3. | pKa | 4. | Q10 |