1 / 14

Cellular Respiration

Cellular Respiration. Overview of Cellular Respiration Section 4.4. Cellular respiration makes ATP by breaking down sugars. If a step requires oxygen, it is called aerobic . If a step occurs in the absence of oxygen, it is called anaerobic . It takes place in three steps: Glycolysis

lillian-schroeder
Download Presentation

Cellular Respiration

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. Cellular Respiration

  2. Overview of Cellular RespirationSection 4.4 • Cellular respiration makes ATP by breaking down sugars. • If a step requires oxygen, it is called aerobic. • If a step occurs in the absence of oxygen, it is called anaerobic. • It takes place in three steps: • Glycolysis • Krebs cycle • Electron transport chain

  3. Cellular respiration • The equation for cellular respiration is: C6H12O6 + 6 O2 6 H2O + 6 CO2 + energy • The equation for photosynthesis is: 6 H2O+ 6 CO2 + light energyC6H12O6 + 6 O2

  4. Comparing photosynthesis with respiration

  5. Glycolysis • Is anaerobic • Occurs in the cytoplasm • One 6 carbon glucose molecule is broken down into two three carbon pyruvate molecules. • Produces 2 ATP molecules

  6. Krebs Cycle • Is aerobic • Occurs in mitochondria • Pyruvate is broken down • One 2 carbon molecule • 1 CO2 molecule • High energy electrons • CoEnzyme A bonds to the 2 carbon molecule

  7. Krebs Cycle • Acetyl CoA enters the Krebs cycle (2C) • Combines with a 4 carbon molecule to form citric acid (6C) • Loses a CO2 (5C) • Loses another CO2 (4C) • Combines with acetyl CoA. • Produces 2 ATP

  8. Electron Transport Chain • Is aerobic • Occurs in mitochondria • NADH and FADH2 donate electrons and transport hydrogen ions. • Produces 34 ATP molecules • Hydrogen ions and electrons combine with oxygen to produce water.

  9. Electron Transport Chain

  10. Aerobic respiration • Aerobic respiration can produce up to 38 ATP molecules from 1 molecule of glucose. • Most ATP is produced in the electrontransportchain.

  11. Anaerobic Respiration • Also called fermentation • In the absence of oxygen • If there is no oxygen to accept electrons or hydrogen ions • NADH and FADH2 cannot be converted to NAD+andFAD2+ • Citric acid is not broken down in the Krebs cycle • Acetyl CoAcannot enter the Krebs cycle

  12. Anaerobic respiration • Pyruvate has to be broken down another way. • In yeasts: • Pyruvate  ethanol and CO2 • Produces 2 ATP molecules • In animals: • Pyruvate  lactic acid • Produces 2 ATP molecules

  13. Uses of fermentation • Cheese • Alcohol • Breads

More Related