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Biology unit 3 cell energy intro to energy notes

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  • 1. BIOLOGY Unit 3 Notes: Energy & Living Things
  • 2. (1) Why Is Energy Needed? • To do work. • To do all life processes: – Grow – Reproduce – Metabolize and Excrete – Respond – Maintain Homeostasis
  • 3. (2) Types of Energy • Chemical Potential Energy: – Stored energy in the bonds of molecules. • Kinetic Energy: – Energy of motion. – Energy being used right now in reactions.
  • 4. (3) Cycling of Energy and Matter • Both energy and matter and continuously cycled throughout the environment. • When molecules are broken down, energy is released to another system. • When molecules are produced (bonded together), energy is stored for later.
  • 5. (4) ATP and ADP • Both store energy in their phosphate bonds. • ATP = Adenosine Triphosphate – Contains 3 phosphates. – Can RELEASE energy if you remove the 3rd phosphate. • ADP = Adenosine Diphosphate – Contains 2 phosphates. – Can STORE energy if you add a 3rd phosphate.
  • 6. (5) Chemical Formulas To Know • CO2 = Carbon Dioxide (gas) • H2O = Water (vapor / gas) • C6H12O6 = Glucose • O2 = Oxygen (gas) • Sunlight = Sunlight
  • 7. (6) Chemical Equation Review • Reactants: – On the left side of equation. – Starting ingredients or molecules for the reaction. • Products: – On the right side of the equation. – What you make at the end of the reaction.