su points total Multiple choice (1 point each) 1. The four elements most common in organisms are a. calcium, iron, hydrogen, and oxygen. b. water, carbon, hydrogen, and oxygen. c carbon, oxygen, hydrogen, and nitrogen. d. nitrogen, carbon, iron, and hydrogen. The diagram to the right shows a group. functional a. amino b. phosphate c. carbonyl d. carboxyl OH 3. A molecule with the formula CreHs2Oto is probably a a. carbohydrate. b. lipid. C、 protein. d. nucleic acid. 4. Although lipid structures differ widely, they are similar in that they a. are insoluble in water b. are all made up of fatty acids. c. are all important for short term energy storage. d. all consist of long hydrocarbon chains. 5. How does the second law of thermodynamics apply to organisms? a. As energy transformations occur, free energy increases and unusable energy decreases. b. To maintain order, life requires a constant input of energy. c. Reactions occur only with an input of energy d. It does not apply to organisms; the complexity of organisms contradic the second law. 6. The reaction described by the graph to Reactants the right a. is endergonic. b. has a negative AG. C. has a positive ΔG. d. is non spontaneous. An en Course of react