Across
- 5. structural protein found in skin
- 7. a substance obtained
- 8. are polymers of amino acids
Down
- 1. deriving from the metabolism of a organism
- 2. energy nessesary to turn a sub to a pro
- 3. increases the rate of a chemical reaction
- 4. the substance on which an enzyme acts
- 6. catalyst to bring about a chemical reaction