Name____________________________ Biology Vocabulary Definitions Block______ Vocabulary For Unit ________________________________ Word Textbook Definition Your Definition Visual Image First Law of Thermodynamics Energy can be transferred and transformed, but it cannot be created or destroyed. Energy cannot be created or destroyed, only changed. Second Law of Thermodynamics Every energy transfer or transformation increases the entropy of the universe. The universe becomes more disorganized over time. Enthalpy The heat content of a system at constant pressure. Measure of heat content in an organism. Enzyme-Substrate Complex A temporary complex formed when an enzyme binds to its substrate molecule(s).