Enzymes

4. ends in these letters
8. a temporary molecule formed when an enzyme comes into perfect contact with its substrate
11. A non protein component sometimes required to allow an enzyme to set in motion a catalytic reaction
12. applied to compounds containing carbon and hydrogen
13. a region on an enzyme that binds to a protein or other substance during a reaction

1. A threshold that must be crossed to facilitate a chemical reaction
2. A substance that speeds up a chemical reaction without participating in it
3. The chemical process by which nutrients are broken down and converted into energy or are used in the construction of new tissue or other material in the body
5. A group of atoms
6. a substance that acts as a catalyst in living organisms
7. help in metabolism by providing structural support and by acting as enzymes
9. the building blocks of proteins
10. the substance on which an enzyme acts