1 / 11

(7) Cellular Respiration

(7) Cellular Respiration. Cellular Respiration. (E) Regulation of pathways through feedback inhibition. (A) Role of ATP & Phosphorylation. (C) The metabolic pathway of respiration: electron transport chain & ATP synthesis. (B)

langer
Download Presentation

(7) 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. (7) Cellular Respiration Cellular Respiration (E) Regulation of pathways through feedback inhibition (A) Role of ATP & Phosphorylation (C) The metabolic pathway of respiration: electron transport chain & ATP synthesis (B) The metabolic pathway of respiration: Glycolysis and the citric acid cycle (D) Substrates for Respiration

  2. Cellular Respiration (c) • State what is meant by the electron transport chain • Describe the process which occurs across the transport electron chain • Describe the formation of ATP by ATP synthase

  3. Stage 3

  4. Electron Transport Chain What is it? • The electron transport chain is a collection of proteins attached to a membrane

  5. Electron Transport Chain • ETC video • Education Scotland animation • HigherEd Video • ETC song

  6. Electron Transport Chain • 3 things to note: • MOVEMENT OF ELECTRONS • High energy electrons pass from one protein molecule in the chain to another • MOVEMENT OF HYDROGEN IONS • The energy received allows the proteins to pump hydrogen across the membrane, so that they can be pumped back across by ATP synthase. • This movement of H+ ions drives the enzyme to synthesise ATP from ADP + Pi • PRODUCTION OF WATER • When electrons come to the end of the chain, they combine with oxygen (the final electron acceptor). • The oxygen then combines with hydrogen to form water.

  7. ATP Synthase • The bulk of ATP produced is because of ATP synthase (a membrane protein). • ATP synthase is driven by the return flow of H+ ions across the mitochondrial membrane. • This return flow of H+ ions rotates part of the membrane protein ATP synthase, catalysing the synthesis of ATP. Watch the lower part of the protein as it rotates round because H+ ions pass through it!

  8. 1 2 3 • The electron transport chain is a collection of proteins attached to a membrane. • As a result of dehydrogenase enzyme action during glycolysis and the citric acid cycle, hydrogen ions and electronsare removed and passed on to the coenzymes NAD or FAD to form NADH or FADH2. • NADHand FADH2 release the high-energy electrons to the electron transport chain where they pass along the chain, releasing energy. • The energy is used to pump H ions across the inner mitochondrial membrane. • The return flow of H ions drives ATP synthase and produces the bulk of the ATP generated by cellular respiration. 4 5 6 7 8 9 10 11 12 12

  9. Checklist • Name of stage • Location • Starting molecule(s) • Intermediate molecule(s) • Final molecule(s) • ATP • Carbon dioxide • Hydrogen • Oxygen • Any other points?

  10. TASK: True or FalseATP synthesis (in more detail!) • Low energy electrons are used to pump oxygen ions across a membrane • Once pumped across the membrane the hydrogen ions remain there and do not flow back • The enzyme involved in ATP synthesis is ATP synthesisase • ATP synthase is not a protein membrane • The final hydrogen acceptor is oxygen • Oxygen combines with hydrogen ions and electrons to form carbon dioxide. • The return flow of the hydrogen ions rotates part of the membrane protein ATP synthase, catalysing the synthesis of ATP. Double false! False! False! False! False! False! TRUE

  11. Cellular Respiration (c) • State what is meant by the electron transport chain • Describe the process which occurs across the transport electron chain • Describe the formation of ATP by ATP synthase

More Related