Photosynthesis and Cellular Respiration (An Introduction)
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Photosynthesis and Cellular Respiration (An Introduction)

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    Photosynthesis and Cellular Respiration (An Introduction) Photosynthesis and Cellular Respiration (An Introduction) Presentation Transcript

    •  
    • Agenda – Monday Oct. 24, 2011 Warm-Up (Metabolism, ATP, Thermodynamics): Lesson (Photosynthesis and Cellular Respiration): Wrap-Up (Lesson Review/EOC questions): Any Remaining Class Time is devoted to A-PLUS ONLY!! (No leaving class; No sleeping!!)
    • Today’s Objectives
      • I will compare and contrast photosynthesis and cellular respiration
      • I will define and classify two types of metabolism: photosynthesis and cellular respiration
    • Warm-Up
      • Define metabolism and name two important types of metabolism.
    • Metabolism – all of the chemical reactions in a cell Cellular Energy
      • Photosynthesis — light energy from the Sun is converted to chemical energy for use by the cell
      • Cellular respiration — organic molecules are broken down to release energy for use by the cell
      Chapter 8
    • Warm-Up
      • Which law of thermodynamics describes how energy is c onserved (not created or destroyed)?
    • Laws of Thermodynamics
      • First law — energy cannot be created nor destroyed.
        • Derived from the law of conservation of energy .
      Cellular Energy
      • Second law — energy cannot be converted without the loss of usable energy.
        • Example: When consumers convert chemical energy into kinetic energy, some energy is loss as heat to the environment but NOT destroyed.
      Chapter 8
    • Warm-Up
      • What is ATP and how is used to create energy?
    • ATP: The Unit of Cellular Energy
      • ATP (Adenosine Triphosphate)
        • has usable energy stored in the phosphate tail
        • releases energy when the bond between the second and third phosphate groups is broken
      Cellular Energy Chapter 8
      • Photosynthesis = process by which producers use the energy of the sun to make food
      • Stores energy in chemical bonds
        • sunlight (radiant energy) is converted to chemical energy
      • Occurs in the chloroplasts
      Cellular Energy Photosynthesis Chapter 8
      • Carbon dioxide and water are the reactants
      • Glucose and oxygen are the products
      Cellular Energy Photosynthesis Chapter 8 The Chemical Reaction
      • Carbon Dioxide + Water  Glucose + Oxygen
    • Two Phases of Photosynthesis
      • Light-Dependent Reactions
      Cellular Energy
      • Light-Independent Reactions or Dark Reactions
      Photosynthesis Chapter 8
    • Light Dependent Reactions
      • Chlorophyll is the green pigment in plants
      Cellular Energy Photosynthesis Chapter 8
      • What happens:
        • Cholorophyll absorbs light energy from the sun
        • Light energy energizes or excites electrons in chlorophyll
        • Enzymes transfer the energized (excited) electrons to ATP
    • Light Independent Reactions
      • These are also called the Dark Reactions
      Cellular Energy Photosynthesis Chapter 8
      • What happens:
        • ATP from the light-dependent reactions is used to convert water and carbon dioxide into glucose and oxygen
    • Cellular Respiration Cellular Energy Chapter 8
      • Cellular Respiration = process by which consumers obtain energy from the chemical bonds in food
      • Chemical bonds (found in organic molecules like sugar) are broken down to release energy (ATP)
        • Chemical energy is converted to kinetic energy and heat
      • Occurs in the mitochondria
    • The Chemical Reaction Cellular Respiration Cellular Energy Chapter 8
      • The reverse of photosynthesis
      • Glucose and oxygen are the reactants
      • Carbon Dioxide and Water are the products
      • Glucose + Oxygen  Carbon Dioxide + Water + Energy
    • Comparing Photosynthesis and Cellular Respiration Cellular Energy Chapter 8 Process Reactants Products Energy Involved Photosynthesis carbon dioxide, water glucose, oxygen input of radiant energy (sunlight) Cellular Respiration glucose, oxygen carbon dioxide, water release of chemical energy (ATP)
    • Wrap-Up
      • photosynthesis
      • cellular respiration
      • homeostasis
      • fermentation
      In which metabolic process are molecules broken down to produce carbon dioxide and water? Cellular Energy Wrap-Up (Oct. 24) Chapter 8
      • chloroplasts
      • Golgi apparatus
      • mitochondria
      • vacuoles
      Where in the plant cell does photosynthesis take place? Cellular Energy Wrap-Up (Oct. 24) Chapter 8
      • to make ATP
      • to process H 2 O
      • to store glucose
      • to deliver oxygen
      What is the overall purpose of cellular respiration? Cellular Energy Wrap-Up (Oct. 24) Chapter 8
    • Which metabolic process is photosynthesis? Cellular Energy Wrap-Up (Oct. 24) Chapter 8 A B
      • glucose
      • oxygen
      • chlorophyll
      • carbon
      Photosynthesis converts light energy to stored chemical energy. What form of chemical energy is used in cellular respiration? Cellular Energy Wrap-Up (Oct. 24) Chapter 8