1 / 8

Fermentation

Fermentation. By: Jordan, Zach, Paige and Gabby. What is Fermentation?. -In the absence of oxygen, some cells convert pyruvic acid into other compounds through additional biochemical pathways in the cytosol. -Glycolysis + additional pathways = fermentation

latoya
Télécharger la présentation

Fermentation

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. Fermentation By: Jordan, Zach, Paige and Gabby

  2. What is Fermentation? • -In the absence of oxygen, some cells convert pyruvic acid into other compounds through additional biochemical pathways in the cytosol. • -Glycolysis + additional pathways = fermentation • -Additional fermentation does not produce ATP, but regenerate NAD+, used to keep glycolysis going to make more ATP.

  3. What is Fermentation? • -Many fermentation pathways and they differ in terms of enzymes used and compounds made form pyruvic acid • -Two common fermentation pathways result in production of lactic acid and ethyl alcohol

  4. Lactic Acid fermentation • -Enzyme converts pyruvic acid into 3 carbon compound (lactic acid) • -Involves transfer of 2 hydrogen atoms from NADH and H+ to pyruvic acid (NADH is oxidized to form NAD+) • -Regeneration of NAD+ in lactic acid fermentation helps keep glycolysis operating • -LAF by microorganisms plays essential role in manufacture of food products

  5. Lactic Acid Fermentation • -Lactic acid occurs in muscle cells during strenuous exercise (use up oxygen more rapidly than it can be delivered to them) • -Muscle cells switch from aerobic respiration to LAF, as oxygen becomes depleted • -Lactic acid built up in muscle cells makes cell’s cytosol more acidic (reduces limit to which the cells can contract) • -Eventually lactic acid diffuses into blood, is transported to liver, is converted back into pyruvic acid when oxygen becomes available

  6. Alcoholic Fermentation • -Converts pyruvic acid into ethyl alcohol in some plant cells and unicellular organisms • Pathway requires 2 steps: • 1. carbon dioxide molecule is removed from pyruvic acid, leaving a 2-carbo compound • 2. 2 hydrogen atoms get added to the 2-carbon compound, forming ethyl alcohol

  7. Alcoholic Fermentation • - Like in LAF, hydrogen atoms come from NADH and H+, regenerating NAD+ for use in glycolysis • - The basis for wine and beer industries. Yeast cells added top fermentation mixture, providing enzymes needed for AF • - As fermentation proceeds, ethyl alcohol accumulates in the mixture until it reaches a concentration that inhibits fermentation.

  8. THE END

More Related