18. Which of the following is a statement of the First Law of Thermodynamics? a.

Question

18. Which of the following is a statement of the First Law of Thermodynamics? a. The entropy of the universe is decreasing b. The entropy of the universe is constant c. Energy cannot be transferred or transformed. d. Energy cannot be created or destroyed e. Energy is conserved by balancing its creation and destruction. 19. For living organisms, which of the following is an important consequence of the First Law of Thermodynamics? a. b. c. The energy content of an organism is constant. Entropy plays no role in cellular equilibrium. The organism ultimately must obtain all of the necessary energy for life from its environment. d. The entropy of an organism decreases with time as the organism grows in complexity. e. Organisms grow by converting energy into organic matter 20. The mathematical expression for the change in free energy of a system is change) AG-AH-TAS, which of the following is NOT correct? ( a· AS is the change in entropy, a measure of randomness b· AH is the change in enthalpy, a measure of potential energy. c. G and as are inversely related. d. An increase in AS indicates an increase in kinetic energy. e. G is the change in free energy, and increases with increasing anabolic activity. 21. A chemical reaction that has a positive AG is best described as a. endergonic b. exergonic c. enthalpathic d. chemically impossible e. catalyzed

Explanation / Answer

18. ENERGY CANNOT BE CREATED OR DESTROYED

19. (a) ENERGY CONTENT CONSTANT

20. (C)

21. Endergonic

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