1 / 36

Lecture 3 Outline (Ch. 9, 10)

Lecture 3 Outline (Ch. 9, 10). Recap of Glycolysis, Coenzyme Junction Cellular Respiration continued A. Citric Acid Cycle (aka Krebs/TCA cycle) B. Electron Transport Chain (ETC) C. Chemiosmosis Anaerobic respiration Respiration using other biomolecules

gada
Download Presentation

Lecture 3 Outline (Ch. 9, 10)

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. Lecture 3 Outline (Ch. 9, 10) • Recap of Glycolysis, Coenzyme Junction • Cellular Respiration continued • A. Citric Acid Cycle (aka Krebs/TCA cycle) • B. Electron Transport Chain (ETC) • C. Chemiosmosis • Anaerobic respiration • Respiration using other biomolecules • Introduction to Photosynthesis • A. Chloroplasts • B. Light wavelengths • VI. Preparation for next lecture

  2. Steps of Respiration

  3. Steps of Respiration • Stages of respiration: • Citric acid cycle • Mitochondrial matrix • e- transfer: redox

  4. Cellular Respiration 2. Citric acid cycle • few ATP so far • now in mitochondrial matrix • 2 Acetyl CoA (2C) join oxaloacetate (4C) • 2 citrate (6C) converted several steps, 4C lost (CO2) • 2 ATP made • e- to carriers (NAD+, FAD)

  5. Citric acid cycle -inputs: 2 Acetyl CoA (2C) -outputs: [2 oxaloacetate (4C)] 2 ATP 6 NADH 2 FADH2 4 CO2 (H2O = none) Where do outputs go?

  6. Which step so far has loaded the most electron carriers? • Glycolysis • Coenzyme junction • Citric acid cycle • They are all equal so far • No electron carriers have been loaded yet

  7. Steps of Respiration • Stages of respiration: • ETC • Proton Motive Force

  8. Cellular Respiration 3. Electron transport chain (ETC) • lots of energy harvested • released in stages • so far, 4 ATP – made by substrate phosphorylation – not as efficient • now, many ATP – made by oxidative phosphorylation

  9. Steps of Respiration • Stages of respiration: 4. Chemiosmosis ATP produced!

  10. Cellular Respiration Electron transport chain (ETC) • ETC  e- collection molecules • embedded on inner mitochondrial membrane • accept e- in turn • e- ultimately accepted by O2 (O2 reduced to H2O)

  11. Electron transport chain (ETC) -inputs: per glucose, 10 NADH 2 FADH2 -outputs: ATP (none yet) ~100 H+ (stored) 10 H2O Where do outputs go?

  12. Cellular Respiration 4. Chemiosmosis • ATP synthase: inner mitochondrial membrane • H+ stock-piled in inner membrane space = gradient • chemiosmosis – ion gradient to do work

  13. Cellular Respiration 4. Chemiosmosis • ATP synthase: enzyme that makes ATP using H+ gradient • H+ must enter matrix here • Generates 1 ATP per ~3.4 H+

  14. Where is the electron transport chain located in the diagram? • Green area • Blue area • Yellow area • Pink area

  15. Cellular Respiration Summary of respiration KNOW THIS DIAGRAM – EXCELLENT SUMMARY 

  16. Cellular Respiration - anaerobic • no O2 – no oxidative phosphorylation • fermentation = extension of glycolysis

  17. Cellular Respiration - anaerobic • Types of fermentation - 1. alcohol • brewing & baking • pyruvate converted to acetaldehyde • acetaldehyde accepts e- • ethanol produced

  18. Cellular Respiration - anaerobic • Types of fermentation - 2. Lactic acid • muscle fatigue • pyruvate accepts e- • lactate produced

  19. Cellular Respiration • Comparison of aerobic vs. anaerobic respiration: Aerobic Anaerobic • e- carriers loaded: • ATP per glucose: • initial e- acceptor: • final e- acceptor:

  20. Cellular Respiration – other biomolecules • Glucose catabolism – one option • Proteins: Catabolized into a.a. Amino group removed (pee out in urine) • Fats: enter CAC or before • If have more glucose than needed, can run “backward” to store energy as glycogen or fats!

  21. Self-Check

  22. Which cells perform aerobic cellular respiration? • Plant cells only • Animal cells only • Bacteria only • Plant and animal cells • Plant, animal and bacterial cells

  23. Photosynthesis - overview

  24. Photosynthesis - overview Overall purpose: • photosynthesis: light chemical energy • complements respiration - light rxn: solar energy harvest - “dark” rxn: energy to organics

  25. Cellular Respiration: (Exergonic) Photosynthesis: (Endergonic) Cellular Respiration vs. Photosynthesis

  26. chloroplast recap Outer membrane Inner membrane Thylakoid membrane Intermembrane space Stroma Thylakoid space

  27. Photosynthesis - overview Chloroplast model: • Photosynthesis - 1. light rxn: store energy & split water NADPH & ATP given off

  28. CO2 + H2O + light energy C6H12O6 + O2 Redox Reactions Equation for photosynthesis synthesis photo

  29. In photosynthesis, which of the following happens to H2O? • Oxidized to oxygen gas • Reduced to oxygen gas • Oxidized to glucose • Reduced to glucose

  30. Photosynthesis – light absorption • visible light ~380 to 750 nm • chloroplast pigments – absorb blue-violet & red/orange - transmit and reflect green

  31. Photosynthesis – light absorption • pigments: • chlorophyll a -energy-absorbing ring -hydrocarbon tail • accessory pigments - chlorophyll b - carotenoids - photoprotective

  32. Photosynthesis – light absorption • chlorophyll a – abs blue-violet, red ~400-450, 650-700 • chlorophyll b & carotenoids – abs broadly blue-violet 450-500 & 600-650 • more wavelengths used for photosynthesis = more light energy absorbed

  33. If a car is red, which light wavelengths are reflected (NOT absorbed)? • Green (500-550 nm) • Red (650-700 nm) • Blue (450-500 nm) • All wavelengths are reflected • All wavelengths absorbed

  34. Things To Do After Lecture 3… • Reading and Preparation: • Re-read today’s lecture, highlight all vocabulary you do not understand, and look up terms. • Read chapter 9, focus on material covered in lecture (terms, concepts, and figures!) • Ch. 9 Self-Quiz: 1-7 (correct using the back of the book). • Skim next lecture. • “HOMEWORK”: • Draw a diagram similar to the cell on the next slide, and show where each step of cellular respiration occurs. • Match up the three boxes each for the citric acid cycle and oxidative phosphorylation (from last lecture). • Compare and contrast aerobic respiration and fermentation for three things that are similar/shared AND three things that are different! • Diagram a chloroplast labeling the three membranes and three spaces. • In the spectrum of visible light (380 to 750 nm), indicate which wavelengths (number AND color) are absorbed by chloroplasts and which are not absorbed.

  35. Self-Check

More Related