15. DNA and RNA are not found in the extra cellar matrix. 16 Cholesterol is a \"
ID: 209820 • Letter: 1
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15. DNA and RNA are not found in the extra cellar matrix. 16 Cholesterol is a "fluidity buffer" meaning it maintains membrane fluidity wide temperature range. 17. Catabolism involves synthesizing large molecules and is endothermic. 18. Which of the following is a statement of the First Law of Thermodynamics? fluidity over 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 For living organisms, which of the following is an important consequence of the First Law of Thermodynamics? 19. a. The energy content of an organism is constant b. Entropy plays no role in cellular equilibrium. c. The organism ultimately must obtain all of the necessary energy for life from its environment The entropy of an organism decreases with time as the organism grows in complexity d. e. Organisms grow by converting energy into organic matter 20. The mathematical expression for the change in free energy of a system is AG -AH- TAS. Which of the following is NOT correct? (a change) a· AS is the change in entropy, a measure of randomness. b. 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 G is best described as a. endergonic b. exergonic c. enthalpathic d. chemically impossible e. catalyzedExplanation / Answer
21. A) Endergonic
Endergonic reactions are the ones in which there is absorption of energy , I.e. an energy input, thus resulting in a positive value for delG. This value would be negative for the emergencies reactions, where energy would be released.
20. B) DelH is the change in enthalpy, a measure of potential energy
This is incorrect because enthalphy measures the internal energy of the system, and thus measures both potential energy and kinetic energy. Enthalpy = KE + PE.
19. C) The organism ultimately must obtain all of the necessary energy for life from its environment.
This is because, there will not be formation of any new energy. This means, whatever energy is at hand, people would have to use it, transform in one of the other manner and use it. Thus, all required energy is present in the environment and has to be used from the environment.
18. D) energy cannot be created or destroyed
17. False
This is false because catabolism is the process in which there is the breaking of larger molecules into their smaller parts so as to release energy. Catabolism is exothermic.
16. True
Cholesterol can be referred to as the regulator in which membrane fluidity is maintained as at high temperatures there would be an increase in the melting point of the membrane and at lower temperatures, it would be inserted with the phospholipid so that there is no stiffening or clustering.
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