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Chapt.4 Energy and Enzymes

Chapt.4 Energy and Enzymes - Energy Enzymes and Biological...

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Energy, Enzymes, and Biological Reactions BIO 2107K: BIOLOGICAL PRINCIPLES I CHAPTER 4
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Metabolism is the set of biochemical reactions that occur in living organisms to sustain life and its activities (maintain itself, grow, reproduce)
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Living organisms engage in metabolic activities
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Metabolism is the set of biochemical reactions that occur in living organisms to sustain life and its activities (maintain itself, grow, reproduce)
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Energy, the Laws of Thermodynamics, and Life 1. Energy exists in different forms and states 2. The laws of thermodynamics describe how energy flows in natural systems xrhombus First law of thermodynamics xrhombus Second law of thermodynamics 3. Enzymes accelerate the rate of biological reactions
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Energy exists in different forms and states Energy is the capacity to do work.
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All forms of energy exist in two states Kinetic energy: energy of motion - electrical energy, sound, heat Potential energy: stored energy - “potential” to be converted to kinetic energy - potential energy is stored in the bonds of molecules, too!
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Potential Energy Kinetic Energy
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Energy conversion occurs in living things Food has potential energy that can be converted to kinetic energy
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Energy conversion occurs in living things The chemical reactions that make and break chemical bonds are called metabolic reactions xrhombus Catabolic reactions xrhombus break down complex molecules xrhombus release potential energy for work xrhombus Anabolic reactions xrhombus convert simple substances into more complex molecules xrhombus require energy
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Sugar ENERGY Catabolic Reactions Amino Acids Proteins Anabolic reactions
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