BI 107EnergyEnzymes

BI 107EnergyEnzymes - Energy Laws of physics are universal Energy and Enzymes Energy ability to do work Biological work active transport muscle

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1/21/2011 1 Energy and Enzymes BI 107 Dr Potter Energy Laws of physics are universal Energy – ability to do work – Biological work: active transport, muscle contraction, anabolism Forms of energy: – Electrical, mechanical, heat – Electromagnetic : used for photosynthesis – Chemical : energy of covalent bonds Energy States of energy: – Kinetic : energy in use, ie muscle contraction – Potential : stored in covalent bonds of organic molecules Measurement of energy – calorie : 1 ml water / 1 o C – Calorie (kilocalorie) : 1 liter water / 1 o C • Nutritional calorie Laws of Thermodynamics First Law = Conservation of Energy – Energy cannot be created nor destroyed – Energy can change forms: • photosynthesis is conversion of electromagnetic to chemical Laws of Thermodynamics Cells need much energy as life is mostly endergonic (energy requiring) Cells can’t create that energy Cells need an “ external ” source of energy – Electromagnetic (sun) energy for autotrophs – Chemical energy for heterotrophs Laws of Thermodynamics Second Law = Law of Entropy – Entropy is “randomness” (least useful) state of energy or matter – Anytime energy is used, some must go to increase entropy – Energy useage is not 100% efficient – Energy cannot be recycled – In biology, heat is entropy
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1/21/2011 2 Laws of Thermodynamics Cells take in energy, use it, and eventually convert it to heat Heat is not very useful, but is “entropy” Cells need a “ continual ” source of external energy Global Energy Flow Sun Autotrophs Organic molecules Heterotrophs Heat Heat ENERGY CANNOT
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This note was uploaded on 11/04/2011 for the course BI 107 taught by Professor Fuller during the Spring '08 term at Montgomery College.

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BI 107EnergyEnzymes - Energy Laws of physics are universal Energy and Enzymes Energy ability to do work Biological work active transport muscle

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