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Cellular Respiration Part 1

Cellular Respiration Part 1. Pages 90 to 92. Fig. 9-2. Light energy. ECOSYSTEM. Photosynthesis in chloroplasts. Organic molecules. CO 2 + H 2 O. + O 2. Cellular respiration in mitochondria. ATP. ATP powers most cellular work. Heat energy. Summarize Relationship .

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Cellular Respiration Part 1

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  1. Cellular Respiration Part 1 Pages 90 to 92

  2. Fig. 9-2 Light energy ECOSYSTEM Photosynthesis in chloroplasts Organic molecules CO2 + H2O + O2 Cellular respiration in mitochondria ATP ATP powers most cellular work Heat energy

  3. Summarize Relationship • Sunlight provides energy to power photosynthesis – ultimate source of energy • Photosynthesis produces glucose and oxygen needed for cellular respiration • Cellular respiration produces water and carbon dioxide needed for photosynthesis; it also produces ATP needed to do cellular work

  4. Do plants undergo cellular respiration? • Yes! • They need ATP for cellular work (building, maintaining, transporting, etc…) just like animals, protists and bacteria

  5. Respiration - Write about it… • When you hear the word RESPIRATION, what do you think of? Write your response on the ½ sheet provided. Write at least 2 sentences explaining what respiration means to you. You should use complete sentences in your answer.

  6. How is your breathing related to cellular respiration? • Breathing provides the oxygen needed for cellular respiration to occur • Breathing eliminates carbon dioxide waste produced by cellular respiration

  7. Complete balanced equation for cellular respiration… • C6H12O6 + 6 O2 6 CO2 + 6 H2O + ATP • Glucose + oxygen yields carbon dioxide + water + Energy • Is this reaction endergonic or exergonic? • Exergonic – releasing energy

  8. Differentiate between life sustaining activities and voluntary activities • Life sustaining • Heart pumping • Breathing • Maintain Body Temp • Essential for LIFE • 75% of your daily energy requirements • Voluntary • Biking • Running • Swimming • Etc.. • 25% of your daily energy requirements

  9. Redox Reactions (oxidation/reduction) • The transfer of electrons during chemical reactions releases energy stored in organic molecules • This released energy is ultimately used to synthesize ATP • Chemical reactions that transfer electrons between reactants are called oxidation-reduction reactions, or redox reactions

  10. Redox Reactions • In oxidation, a substance loses electrons, or is oxidized • In reduction, a substance gains electrons, or is reduced (the amount of positive charge is reduced)

  11. Fig. 9-UN1 becomes oxidized (loses electron) becomes reduced (gains electron)

  12. Cellular Respiration - Redox • What is being oxidized (gives up electrons) • Glucose • What is being reduced (takes on electrons) • Oxygen

  13. Fig. 9-UN3 becomes oxidized becomes reduced

  14. What is the role of dehydrogenase in cellular respiration? • The enzyme that catalyzes the chemical reaction in which one or more hydrogen atoms are removed from a molecule Dehydrogenase

  15. What is the role of NAD+ (NADH)? • NAD+ accepts electrons from carbon containing compounds (e.g. glucose) to form NADH • NADH then shuttles the electrons to an electron transport chain where they are used to create ATP • It is one of the electron carriers of cellular respiration • This is a redox reaction • What is oxidized? • Glucose / carbon compounds • What is reduced? • NAD+ to form NADH

  16. Fig. 9-4 2 e– + 2 H+ 2 e– + H+ H+ NADH Dehydrogenase Reduction of NAD+ NAD+ 2[H] H+ + + Oxidation of NADH Nicotinamide (reduced form) Nicotinamide (oxidized form)

  17. Fig. 9-5 1/2 O2 H2 + 1/2 O2 + 2 H (from food via NADH) Controlled release of energy for synthesis of ATP 2 H+ + 2 e– ATP Explosive release of heat and light energy ATP Electron transport chain Free energy, G Free energy, G ATP 2 e– 1/2 O2 2 H+ H2O H2O (a) Uncontrolled reaction (b) Cellular respiration

  18. Where is the Electron Transport Chain? • The inner membrane of the mitochondria (aka – the cristea)

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