1 / 10

Enzymes and Chemical Reactions Honors Biology

Enzymes and Chemical Reactions Honors Biology. Page 1 of 9. Chemical reactions. Some break down substances Some build substances Most need to happen quickly. Page 2 of 9. Enzymes. Very specific; Are not used up or changed Each type enzyme can catalyze only one chemical reaction

harper
Télécharger la présentation

Enzymes and Chemical Reactions Honors Biology

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. Enzymes and Chemical ReactionsHonors Biology Page 1 of 9

  2. Chemical reactions • Some break down substances • Some build substances • Most need to happen quickly Page 2 of 9

  3. Enzymes • Very specific; Are not used up or changed • Each type enzyme can catalyze only one chemical reaction • Catalyst – changes rate of chemical reaction

  4. Enzymes • Involved in many processes - digestion, respiration, reproduction, movement, cell regulation • Helps maintain “homeostasis”

  5. Enzymes • Substrate = substance that an enzyme works on • Enzyme binds to substrate at “active site” • How they “fit” together depends on structure of enzyme; pH and temp. can change structure Page 8 of 9

  6. How enzymes work Example of a substrate = sugar

  7. Starting Chemical Reactions • Activation energy - amount of energy needed for a chemical reaction to occur • Enzymes reduce amount needed Page 3 of 9

  8. Enzymes and Heat • Sometimes heat is needed to start a reaction • Too much heat can “denature” enzymes - make them inactive Page 4 of 9

  9. pH and Enzymes • Can also denature enzymes; cells affected • In organisms pH must be kept in narrow range • Buffers make sure this happens Page 5 of 9

  10. pH Scale Examples

More Related