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Ch 7 Cellular respiration

Ch 7 Cellular respiration. What is the equation for photosynthesis? What do plants need? What do plants make? If this is what plants do to make sugar… what do we do once we’ve eaten that sugar? What do YOU need? What do YOU make?. 7-1: Glycolysis and fermentation.

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Ch 7 Cellular respiration

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  1. Ch 7 Cellular respiration

  2. What is the equation for photosynthesis? • What do plants need? • What do plants make? • If this is what plants do to make sugar… what do we do once we’ve eaten that sugar? • What do YOU need? • What do YOU make?

  3. 7-1: Glycolysis and fermentation • Cellular respiration: complex process by which cells make ATP by breaking down organic compounds • Heterotrophs must do this to obtain energy • Do autotrophs? • Yup!

  4. Overview

  5. Overview • The products of photosynthesis are the reactants for cellular respiration • The products of cellular respiration are the reactants for photosynthesis

  6. Cellular respiration A process with options Glycolysis always happens first What happens next depends on Oxygen • Oxygen present: • Aerobic respiration • Oxygen not present: • Anaerobic respiration Or…

  7. Page 132 • Copy figure 7-2 in your notebooks. Be sure to include labels

  8. Glycolysis • Organic compounds (6-C) converted into 3-C pyruvic acid • Produces a small amount of ATP and NADH • NADH? Familiar? • Another high energy electron shuttle • This is an ANAEROBIC process (?) • Does not require oxygen

  9. Glycolysis • In cytoplasm • Starts with 6-C Glucose • 2 ATP invested • 2 NAD+  NADH • 6-C glucose broken into two 3-C G3P • Each G3P use to make 2 ATP (4 total) • G3P converted into pyruvic acid

  10. Glycolysis easy • 6-C Glucose broken into 2 3-C Pyruvic acid • In the process we invest: • 2 ATP • In the process we create: • 4 ATP • 2 NADH

  11. Aerobic respiration • If Oxygen present, • Pyruvic acid broken down to produce more NADH • NADH is used to make ATP

  12. Anaerobic respiration • If oxygen is not present, • Pyruvic acid enters another cycle • Combination of glycolysis and anaerobic fermentation is called fermentation

  13. Fermentation • When oxygen is not present (anaerobic conditions) • Pyruvic acid converted to other compounds • In cytoplasm • Fermentation: Glycolysis + regeneration of NAD+ • Does not produce ATP • Fermentation reproduces NAD+ so ATP can be gained through continual glycolysis • If NAD+ not regenerated  no glycolysis  no ATP

  14. Alcoholic fermentation • Pyruvic acid converted to ethanol • yeast • bacteria • Bread • Wine, beer

  15. Lactic acid fermentation • Pyruvic acid converted to Lactic acid • Cheeses • Yogurt • Cultivated dairy products • Makes muscles sore after strenuous workout

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