Cell_Information

Cell Information Chapter 6 Energy Flow in the Life of a Cell I. Energy is the capacity to do work Uses of energy in living things 1. Mechanical work ¨C movement 2. Biosynthetic work ¨C metabolism 3. Transport work ¨C getting things in and out of cells I. Energy is the capacity to do work Types of Energy 1. Potential energy¡ªstored energy 2. Kinetic energy¡ªenergy of movement 3. Potential and kinetic energy can exist in many forms: mechanical, chemical, electrical, heat, etc. II. Thermodynamics First law of thermodynamics Energy cannot be created or destroyed Total energy remains the same although it may change form How does this relate to ¡°conservation of weight¡± described by Professor Morrison' II. Thermodynamics Second law of thermodynamics When energy is converted from one form to another, the amount of useful energy decreases Any spontaneous change causes a more uniform distribution of energy resulting in less useful forms of energy Unless energy is added to a system, spontaneous processes result in increases in randomness and disorder. Also, called entropy II. Thermodynamics Second law of thermodynamics Organization of matter and energy Concentrated energy is more ordered (complex) chemically The six carbon atoms of glucose (a simple sugar) are much more ordered (and therefore contain more potential energy, than the cells, energy, reactions, chemical, thermodynamics, reaction, exergonic, endergonic, things, molecules, metabolism, living, enzymes, work, useful, potential, metabolic, law, high, glucose, carbon, called, activation, ¨c, ¡ú, wood, very, total, stored, spontaneous, six, second, requirements, released