BISC276 Chapter Notes - Chapter 4: Cellular Respiration, Kinetic Energy, Activation Energy

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Chapter 4: energy and cellular metabolism o o o. Chemical work- making and breaking of chemical bonds. Transport work- enables cells to move ions, molecules, and larger particles though he cell membrane and through the membranes. Concentration gradients- distributions of molecules in which the concentration is higher on one side of a membrane than on the other o. Cellular level -> movement includes organelles moving around in a cell, cells changing shape, and cilia and flagella beating. Most is mediated by motor neurons that make up certain intracellular fibers and filaments of the cytoskeleton. Ball poised on top of a mountain has potential energy because it has the potential to start moving down the hill. Chemical bonds-> potential energy is stored in the position of the electrons that form the bond. Energy can be converted from one form to another. 1st law of thermodynamics (law of conservation of energy): the total amount of energy in the universe is constant.

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