Cell Biology Exam 2 Multichoice review

Cell Biology Exam 2 Multichoice review - Answer the...

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Unformatted text preview: Answer the following Multiple Choice questions to test your knowledge of this chapter. 1 . From the equation G = H -TS it is clear that: increasing the entropy of a system will increase the probability of spontaneous change increasing the temperature of a system will increase the probability of spontaneous change the capacity of a system to perform work is related to the total energy of the system a decrease in the system's total energy will increase the probability of spontaneous change all of the above are true 2 . An endergonic reaction is characterized by: reactants that are more complex than products a value for G that is negative the net release of free energy a requirement for energy its tendency to occur spontaneously 3 . What is energy? the ability to cause specific changes the capacity to produce heat movement the rearrangement of chemical molecules within matter the amount of food eaten 4 . All are examples of mechanical work EXCEPT: the ciliary movement in your lungs sodium and potassium pumps chromosome movement during mitosis the whipping motion of a bacterial flagellum cytoplasmic streaming 5 . Thermodynamic spontaneity can be measured by changes in: entropy and free energy entropy and enthalpy the rate of a reaction enthalpy free energy and work 6 . Organisms are described as thermodynamically open systems. This means that: because energy is conserved, organisms do not require energy input from their surroundings organisms are capable of circumventing the second law of thermodynamics the metabolism of an organism is isolated from its surroundings organisms can reverse the increase in entropy organisms can acquire energy from their surroundings 7 . Cells need energy for which of the following purposes? mechanical work biosynthesis heat production electrical work all of the above 8 . __________ trap solar energy by pigment systems and convert __________ into more complex cellular materials. Phototrophs, chlorophyll Chemotrophs, oxygen Phototrophs, carbon dioxide and water Chemotrophs, carbon dioxide and water Phototrophs, oxygen 9 . The exchange of energy between a system and its surroundings occurs as: light and heat chemical reactions heat and work light light and work 10 . The G for the oxidation of glucose to carbon dioxide and water is -686 kcal/mol. The G for the synthesis of glucose is +686 kcal/mol. This is proof of: spontaneous generation the first law of thermodynamics irreversibility of chemical reactions the third law of thermodynamics the second law of thermodynamics 11 . According to the second law of thermodynamics: the quantity of heat in the universe is constant the universe always tends toward greater entropy it is not possible to observe an increase in molecular organization energy can neither be created nor destroyed life should be impossible 12 . A spontaneous reaction is: characterized by a decrease in entropy of the universe not possible endergonic characterized by an increase in free energy into the system exergonic 13 . G = H -TS. In this equation G represents __________ and H represents __________. __________....
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This note was uploaded on 04/15/2008 for the course BIOL 4301 taught by Professor Cone during the Spring '08 term at East Texas Baptist University.

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Cell Biology Exam 2 Multichoice review - Answer the...

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