Biology Exam 3 Study Sheet • Metabolism : total chemical activity of a living organism. o Consists of 1000’s of individual chemical reactions. o Builds up of complexity (using energy) or breaks down (releasing energy) Anabolic reactions (anabolism) link simple molecules together to form more complex ones. • Requires input of energy and captures it in chemical bonds that are formed o Example: synthesis of a protein from amino acids Catabolic reactions (catabolism) break down complex molecules into simpler ones. • Releases energy stored in chemical bonds • Energy released drives anabolic reactions • Energy: the capacity for change. o First law of Thermodynamics : no cell creates or destroys energy; it can only be transformed (to heat) from one kind of energy to another. The total energy before and after the conversion is the same. Kinetic energy
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