1 / 17

LG: How do enzymes facilitate chemical reactions? 12/3/2012

LG: How do enzymes facilitate chemical reactions? 12/3/2012. LG: How do enzymes facilitate chemical reactions? 12/3/2012. Do Now: Complete the following chart. Enzyme. CATALYST – substance that affects rate of chemical reaction (speed up) Is not changed during use

aldan
Télécharger la présentation

LG: How do enzymes facilitate chemical reactions? 12/3/2012

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LG: How do enzymes facilitate chemical reactions? 12/3/2012

  2. LG: How do enzymes facilitate chemical reactions? 12/3/2012 • Do Now: Complete the following chart.

  3. Enzyme • CATALYST – substance that affects rate of chemical reaction (speed up) • Is not changed during use • May be recycled (used again) • Protein molecule • Used in digestion, synthesis, cellular respiration, and photosynthesis • End in –ase(ex: lipase, amylase, lactase, DNA polymerase…)

  4. Nothing works without enzymes • How important are enzymes? • all chemical reactions in living organisms require enzymes to work • building molecules • synthesis enzymes • breaking down molecules • digestive enzymes

  5. How does enzyme work? • ****Enzymes are not changed by the reaction (can be reused!)

  6. It’s shape that matters! • Lock & Key model • shape of protein allows enzyme & substrate to fit • specific enzyme for each specific reaction Substrate

  7. Experiment

  8. Experiment • Hand = enzyme • Thumb+index finger = enzyme’s active site • Toothpicks = substrates • Breaking the toothpick in two pieces = enzyme reaction

  9. Experiment • Part A- rate of product formation in an Enzyme-facilitated reaction (normal enzyme activity) • Part B- effect of substrate concentration on enzyme activity • Part C- effect of temperature on enzyme activity

  10. Class Data • Part A: Normal enzyme activity

  11. Class Data • Part B- effect of denaturation on enzyme activity

  12. Class Data • Part C:effect of substrate concentration on enzyme activity

  13. Analysis/what affects enzyme activity? • Temperature Optimum temperature 35°- 40°C (body temp = 37°C)

  14. 2. pH • changes in pH changes protein shape • most human enzymes = pH 6-8 • depends on where in body • pepsin (stomach) = pH 3 • trypsin (small intestines) = pH 8

  15. 3. Substrate concentration

  16. For enzymes…What matters? SHAPE!

More Related