1 / 23

Cellular Respiration

Cellular Respiration. Glycolysis Krebs cycle Electron transport. Learning check. This figure represents an overview of the different processes of cellular respiration. . Which of the following correctly identifies the different processes?.

imelda
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 • Glycolysis • Krebs cycle • Electron transport

  2. Learning check This figure represents an overview of the different processes of cellular respiration. Which of the following correctly identifies the different processes? • 1. Glycolysis; 2. Electron transport chain; 3. Krebs cycle • 1. Glycolysis; 2. Krebs cycle; 3. Electron transport chain • 1. Krebs cycle; 2. Electron transport chain; 3. Glycolysis • 1. Electron transport chain; 2. Glycolysis; 3. Krebs cycle

  3. What would happen to the flow of electrons if oxygen were not present? The flow of electrons would continue but at a slower rate. The flow would cease and ATP production would stop. The presence of oxygen would have no effect.

  4. Cyanide binds strongly with the last electron carrier in the chain. How would this affect the flow of electrons? The flow of electrons would continue but at a slower rate. The flow would cease and ATP production would stop. The presence of cyanide would have no effect.

  5. How many ATPs?

  6. Cell Respiration Overview Glucose: Stores energy in the molecule Cell respiration: • Breaks down the molecules • Extracts the contained energy • Transfers electrons (from glucose) • To hydrogen carriers (e.g., NADH) • And to make ATP • Giving off waste products (CO2 & H2O) 1st stage: 2nd & 3rd stage: Cytoplasm Mitochondria

  7. 1st stage: 2nd stage: 3rd stage: Glycolysis Krebs cycle (or citric acid) Electron transport

  8. Glycolysis, in the cytoplasm Series of steps (but 2 phases) Glucose 2 pyruvic acid molecules 1. As bonds in glucose are broken Electrons (and H+ ions) NAD+ 2. NADH Glucose Is oxidized NAD+ Is reduced Net output is 2 ATP for each glucose molecule But, most of the released energy carried by NADH

  9. Glucose 2 pyruvic acids Phase one 3 carbon 6 carbon 3 carbon

  10. Glycolysis, phase 1 Some ATP is used to start the ‘breakdown’ of glucose Mitochondria Cytoplasm View Activity: Glycolysis

  11. Glycolysis, phase 2 High energy electrons are donated To NAD+ Forming NADH

  12. Glycolysis, phase 2 And, phosphate groups are transferred ATP is made

  13. In-between glycolysis & Krebs Just before (or as) they enter the mitochondria Pyruvic acid molecules are modified And CO2 is released The altered molecule is acetic acid (…vinegar!) Acetic acid is attached to a carrier molecule Called coenzyme A And forms acetyl CoA To the mitochondrion

  14. Learning check 7 3 4 2 6 8 1 5 • Name of molecule • What does the arrow refer to? • Name of molecule • Name of molecule • Where does this take place? • Name molecule • Name molecule • Name molecule • Name the reaction

  15. Krebs cycle, in the mitochondria Series of reactions Continues to break down the sugar Present as acetic acid Captures more energy As NADH & FADH2 And more CO2 is released Net output is 2 ATP for each glucose molecule But again, most of the released energy carried by NADH

  16. Krebs (citric acid) cycle & energy production Citric acid Waste: 2 CO2 Fuel: Acetic acid 3 3 Acceptor molecule View Activity: The Citric Acid Cycle

  17. Electron Transport, in the mitochondria Most of the ATP is produced in the ET And, NADH & FADH donate their electrons to the ET At the end of the chain of steps O2 exerts a strong pull on electrons And combines electrons & H+ ions to form H2O The ‘downhill’ flow of electrons powers an enzyme ATP synthase Which produces ~ 34 ATP

  18. Electron Transport An array of molecules (…proteins) In the inner membrane of the mitochondrion View Activity: Electron Transport

  19. Electrons move from one member to the next The energy given up pumps H+ to inner space Matrix Oxygen captures electrons Hydrogens are added, water forms

  20. The buildup of H+ ions give up energy When they diffuse through a special protein ATP synthase Matrix ATP synthase captures their energy To make ATP

  21. Learning check, name the numbered parts 15 10 How many? 4 7 11 1 6 9 14 2 3 12 8 16 17 13 5 18

  22. Learning check • Of the 3 stages of cell respiration, which produces the most ATP per glucose? • In glycolysis, _______ is oxidized and _______ is reduced. • The final electron acceptor of the electron transport chains in mitochondria is _______.

  23. Learning check • Cells can harvest the most chemical energy from which of the following? • An NADH molecule • A glucose molecule • Six carbon dioxide molecules • Two pyruvic acid molecules

More Related