Biolog 6 - Chapter 6 Metabolism A Energy Energy is the...

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Chapter 6: Metabolism A. Energy Energy is the capacity to do work. Energy exists in various forms, and cells transform energy from one type into another. The first law of thermodynamics states that energy can be transferred and transformed, but it cannot be created or destroyed. The first law is also known as the principle of conservation of energy . During every transfer or transformation of energy, some energy is converted to heat, which is the energy with the random movement of atoms and molecules. A system can use heat to do work only when there is a temperature difference that results in heat flowing from a warmer location to a cooler one. If temperature is uniform, as in a living cell, heat can only be used to warm the organism. Energy transfers and transformations make the universe more disordered due to this loss of usable energy. Entropy is a quantity used as a measure of disorder or randomness. The more random a collection of matter, the greater its entropy. The second law of thermodynamics states that every energy transfer or transformation increases the entropy of the universe. There is an unstoppable trend toward randomization of the universe.
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