1. The Chemistry of Life
part 4: enzymes

2. Chemical Reactions (CR)
CR = process of changing one set of chemicals to another.
-Ex. 4Fe + 3O2  2Fe2O3 (Iron+oxygen=rust)
When an organism;
Grows
Reproduces
Moves
Interacts with its environment…
…Chemical reactions take place!!

3. Enzymes are Catalysts
Catalyst – substance that speeds up the rate of the chemical reaction
Enzymes are proteins that act as biological catalysts.
They speed up the rate of all chemical reactions that take place in your body
Enzymes lower activation energy,
The energy required to get a reaction to run

6. Mechanism of Action
Enzymes have a site where reactants can be brought together  the “active site”
Enzymes must bind to the reactants – called the substrate
Form the enzyme – substrate complex
Products are formed

10. Key Points
Enzymes are specific – they will catalyze only a single reaction
Shape – lock and key
Enzymes are not changed or destroyed in this process. (reused)

11. What Affects Enzymes Temperature pH Amount of enzyme
Amount of substrate

12. Recognition
• lactase – breaks down lactose (milk sugars) • diastase – digests vegetable starch • sucrase – digests complex sugars and starches • maltase – digests disaccharides to monosaccharides (malt sugars) • invertase – breaks down sucrose (table sugar) • glucoamylase – breaks down starch to glucose • alpha-glactosidase – facilitates digestion of beans, legumes, seeds, roots, soy products, and underground stems

17. SUMMARY Enzymes are proteins that serve as catalysts for your metabolism (speeding up digestion by lowering the activation energy).

18. Enzyme and Digestion Student presentation;
1) From your plate to your cells, detailed steps of food digestion.
2) 1-2 Digestive enzymes, where, what, conditions they operate in
3) Roles/processes WITHIN your cells that enzymes facilitate
25 min research,10 min white board,
10 min gallery walk
Animation Summation
Click HERE