1 / 9

Cellular Respiration Part 2

Cellular Respiration Part 2. Glycolysis - Pages 93 to 95. Overview: Cellular Respiration. Cellular Respiration takes place in three steps: Glycolysis – initial breakdown of glucose; very little direct energy production; takes place in cytoplasm

brad
Download Presentation

Cellular Respiration Part 2

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 Part 2 Glycolysis - Pages 93 to 95

  2. Overview: Cellular Respiration • Cellular Respiration takes place in three steps: • Glycolysis – initial breakdown of glucose; very little direct energy production; takes place in cytoplasm • Krebs Cycle – finishes the breakdown of glucose; very little direct energy production; takes place in the matrix of the mitochondria • Oxidative Phosphorylation – major energy producing process; takes place in the cristea of the mitochondria

  3. Fig. 9-6-3 Electrons carried via NADH and FADH2 Electrons carried via NADH Oxidative phosphorylation: electron transport and chemiosmosis Citric acid cycle Glycolysis Pyruvate Glucose Mitochondrion Cytosol ATP ATP ATP Substrate-level phosphorylation Substrate-level phosphorylation Oxidative phosphorylation

  4. Glycolysis • Glycolysis (“splitting of sugar”) breaks down glucose into two molecules of pyruvate • Glycolysis occurs in the cytoplasm and has two major phases: • Energy investment phase • Energy payoff phase

  5. Fig. 9-8 Energy investment phase Glucose 2 ADP + 2 2 ATP used P Energy payoff phase formed 4 ADP + 4 P 4 ATP 2 NAD+ + 4 e– + 4 H+ 2 NADH 2 Pyruvate Net Glucose 2 Pyruvate 4 ATP formed – 2 ATP used 2 ATP 2 NAD+ + 4 e– + 4 H+ 2 NADH + 2 H+

  6. Glycolysis • Takes place in the cytoplasm • Believed to be the oldest metabolic process – shared by all organism • ATP produced during the process via substrate level phosphorylation

  7. Glycolysis – summarized in words • 2 molecules of ATP are used to start the process – phosphorylating (energizing) the 6 carbon molecule– unstable 6C • Unstable 6 C splits into to 3 C called G3P • Oxidation of 2-3C (G3P) and reduction of 2 NAD+ to 2NADH releases enough energy to phosphorylate the 3C molecule • Phosphates removed from 2-3C molecules in substrate level phosphorylation to produce 4 ATP; end with pyruvate

  8. Glycolysis Summary • Reactants • Glucose, 2ATP and 2NAD+ • Products • Pyruvate, 4 ATP, and 2 NADH • Net gain of ATP • 2 ATP • Do you need to know all of the intermediates in the process? • NO – understand that it occurs in several steps, each step involves different enzymes & results in a different carbon compound

More Related