Biology9

  Chemical Reactions:

1. What is a chemical reaction? Changing chemicals into new chemicals.

2. What are the reactants?CO₂+H₂O

3. What are the products? H₂CO₃

4. What is the activation energy? Energy used to get reaction started

                   Enzyme Structure & Function

1. Most enzymes are what type of macromolecule? Proteins 

2. Most enzymes are tertiary or quaternary structures

3. Enzymes act as what in reaction? catalyst

4. Are enzymes permanently changed in the chemical reaction they are involved in? N not permanently changed.

5. Will and enzyme work on any substance? No, certain substances only : Lock & Key

6. Can,enzymes be reused? Yes

7. What ending is found on many enzymes?-ase

8. Give three examples of enzymes with this ending

            -Sucrase

-lactase

-maltase

9. How does an enzyme work? Weaken bonds lowers activation energy

10. What effect does an enzyme have on activation energy needed to start a reaction? It lowers it 

11. Hydrogen peroxide H₂O₂ is a common waste product of cells. Enzymes called catalases in cells break down into harmless H₂O₂ 

12. What is meant by the term substrate? Reactants

13. What is meant by active site? Where substrate bonds to an Enzyme, Restricted reigion

14. What is meant by induced fit

           -change in shape

           -induced by structure

           -Change locks

15. List 4 factors that can affect enzyme activity

 -change in temperature

-pH

-cofactors & coenzymes

-Inhabeters

16. What is the effect of high temperature on an enzyme? Denature enzymes

17. What temperature do most enzymes do best at? Normal body temperature

18. Most enzymes like a pH near? 6-8

19. To denature an enzyme mans the enzyme becomes what and can no longer work properly? unfolded

20. What are 4 key roles for enzymes 

-Regulate chemical pathways

-Make materials the calls need

-Realease energy

-Transfering information