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KEY BMB 280 Exam 1C 2007 - BMB 280 Exam#1(95 points(Covers...

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BMB 280 Exam #1 (95 points) Name ___ _KEY ____________ (Covers Lectures #1-6, Cell Introduction to Enzymes) Thursday February 8, 2007 PART #1: Multiple Choice: Circle the one best answer (2 points/question; 42 points total) 1. An open system , such as the cell, a. can exchange matter with its surroundings. b. can exchange matter with its surroundings but not energy. c. can exchange energy with its surroundings. d. can exchange valentines. e. a and c 2. The effect of a competitive inhibitor on an enzyme-catalyzed reaction can be reversed by: 3. Possible advantages inherent in the branched structure of glycogen include: a. branching allows more efficient storage of energy since more glucose monomers can be packed into a smaller space. b. branching creates more free ends allowing glycogen to be disassembled more rapidly when free glucose is needed c. branching creates more free ends allowing faster assembly of glucose units when glycogen is synthesized. d. a, b and c are all correct. 4. Fatty acids: a. have hydrophilic character. b. form an extensive, dynamic network of hydrogen bonds with water in aqueous solution. c. are important building blocks of triglycerides. d. are positively charged under usual cellular conditions. e. together with nitrogenous bases and phosphate, form nucleic acids. 5. Entropy: a. is the heat released from a thermodynamically unfavorable reaction. b. cannot be created or destroyed, only changed from one form to another. energy c. is the driving force behind George W.’s proposed federal budget. d. is the tendency of the universe to go to a state of maximum disorder. e. is the desire for all atoms to obtain a full outer shell of electrons. 6. Enzymes: a. lower the potential energy of a reaction. b. lower the G of a reaction. Enzymes do not alter G! c. lower the activation energy (E A ) of a reaction. d. increase the kinetic energy of a reaction. 1
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