Respiration & photosynthesis

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Text of Respiration & photosynthesis

  • 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) + PhosphateAdenosine 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 & bacterianot 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 2into 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 + energyC 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 2as 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 + energyC 6 H 12 O 6+ 6O 2

C 6 H 12 O 6+ 6O 2 6CO 2+6H 2 O + energy