QUIZ 1. According to the first law of thermodynamics, what is the change of internal energy of a system determined by? a. The net work done by the system b. The net heat output of the system c. The change in its temperature before and after work is done d. The difference between the heat put in and the work output of the system Answer: d. The change in internal energy of a system is the difference between the heat put in and the work output of the system. 2. What is the internal energy of a given system? a. The potential energy of the system b. The difference between the potential energy and the kinetic energy of a system c. The sum of the potential energy and the kinetic energy of a system d. The kinetic energy of the system Answer: c. The internal energy of a given system is the sum of the potential energy and kinetic energy of a system. It is independent of how the energy gets into the system. 3. Which of these biological processes is not considered a one-way energy process in that it is reversible rather than being irreversible? a. Photosynthesis b. Glucose metabolism c. Fat storage d. Exercise Answer: c. Fat storage and the loss of fat are reversible processes that change the potential energy of the system. The other biological processes are considered irreversible processes.
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