Enzyme

5. The starting substances in a chemical reaction.
8. A model of enzyme action where the active site changes shape slightly to fit the substrate when it binds.
9. A chemical reaction that requires an input of energy to occur.
10. An organic helper molecule that assists an enzyme in carrying out it's function.
11. The new substances formed after a chemical reaction.

1. A chemical reaction that releases energy during the process.
2. Reactions that build large, complex molecules from smaller ones and require energy.
3. The sum of all chemical reactions that occur inside a living cell.
4. The minimum amount of energy needed to start a chemical reaction.
6. Reactions that break down large molecules into smaller ones and release energy.
7. A model of enzyme action where the active site has a fixed shape and substrate fits perfectly into it, like a key into a lock.
8. Molecules that reduce enzyme activity by interfering with the enzyme's function.