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Respiration & photosynthesis
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Respiration & photosynthesis

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  • 1. Energy Transformations: Photosynthesis & Respiration
  • 2. Read pages 218-220
    • What is energy?
    • List 2 processes (in the cell) that require energy (the ability to do work).
    • What is the difference between an autotroph and a chemotroph?
    • What is metabolism?
  • 3. ATP & ADP
    • ATP: Adenosine triphosphate
    • adenine + ribose + 3 phosphates
    • Energy storing molecule, only stores energy for a few minutes
    • Source of all cell energy
    • When one phosphate group breaks off, energy is released
    Adenine Ribose 3 Phosphate groups
  • 4.
    • ADP: Adenosine diphosphate
    • Adenine + ribose + 2 phosphates
    • Molecule that results from ATP losing one P
    • Another P may be added later
    ADP ATP Energy Energy Partially charged battery Fully charged battery Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP)
  • 5. Describe organelles involved in energy transformation
    • Energy transformation is when energy is converted from one form to another.
    • Energy transformations involve photosynthesis and respiration.
  • 6. Photosynthesis
  • 7.
    • CHLOROPLASTS:
    • Found in plant cells, some protists & bacteria not animal cells
    • Contain pigment called chlorophyll (green)
    • Allows plants to go through photosynthesis by converting light into energy for the cell
  • 8. Overview Photosynthesis
    • Photosynthesis: process using energy from sunlight to convert water and CO 2 into oxygen and carbohydrates (sugar)
    • Two parts:
    • Light dependent reactions: produce O 2 & converts ADP to ATP
    • Calvin cycle (dark reactions): use ATP from light reactions to produce sugars
    Light Energy CO 2 + H 2 O Sugars + O 2 Chloroplast
  • 9.
    • Chlorophyll : green pigment in cells that absorbs blue & red light energy
    • Moves energy to electrons that drive reactions
    • Equation for photosynthesis:
    • 6CO 2 +6H 2 O + energy  C 6 H 12 O 6 + 6O 2
  • 10.
    • MITOCHONDRIA: “powerhouse” of cell
    • Releases energy from food molecules
    • Found in both animal and plant cells
    • A cell that needs more energy has more mitochondria
    • Ex: muscles, growing cells, areas of repair
  • 11. Overview cellular respiration
    • Respiration: process that releases energy by breaking down food when oxygen is present
    • Equation for Respiration:
    • C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + energy
  • 12.
    • Anaerobic respiration: (fermentation) occurs without oxygen present
    • Two types:
    • Alcoholic: form ethyl alcohol and CO 2 as waste products; used to make bread rise
    • Lactic acid: produces lactic acid in muscles when exercising without enough oxygen
  • 13. Photosynthesis Respiration Function Energy storage Energy release Location Chloroplasts Mitochondria Reactants Carbon dioxide water Glucose oxygen Products Glucose oxygen Carbon dioxide water Equation
    • 6CO 2 +6H 2 O + energy  C 6 H 12 O 6 + 6O 2
    C 6 H 12 O 6 + 6O 2  6CO 2 +6H 2 O + energy