Biology 2483A Lecture Notes - Chloroplast, Heterotroph, Vascular Bundle

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Energy is a basic requirement for all organisms. We require it for physiological maintenance, growth, and reproduction. If energy input stops, so does biological functioning. Enzymes fail if replacement proteins can not be made and cell membranes degrade and organelles cease to operate without energy to maintain and repair them. Sources of energy include radiant energy which comes from the sun (chemical energy is derived from radiant energy) and chemical energy which is stored in the food that is being consumed (plants converted radiant energy into chemical energy). These are the types of energy that organisms use to meet the demands of growth and maintenance. Kinetic energy is associated with motion of molecules that make them up objects. This is important for controlling the rate of activity and metabolic energy demand of organisms (done through influence on rate of chemical reactions & temp)

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