Exam 2 Version 1 Key

Exam 2 Version 1 Key - Biology 181R Sections 5 6H Brian...

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Biology 181R Sections 5, 6H Brian Larkins and Ramin Yadegari Hour Exam #2 October 9, 2009 (Version 1 Key) LAST NAME: _____________________ FIRST NAME:__________________________ UA NET ID#: ___________________ Instructions: Before starting this exam, read the Instructions! Fill in your name and NetID on both the exam booklet and the bubble sheet. Circle your answer on the exam copy AND use a #2 pencil to mark the corresponding answer on the bubble sheet. If you must change an answer, be certain that your first choice is erased completely. The bubble sheet is your “official” answer sheet! Read each question carefully and choose THE BEST answer. If you are unclear regarding what the question is asking, raise your hand and ask for clarification. When you have finished the exam, turn in both the bubble sheet and the exam book to the instructor at the front of the room. There are multiple versions of this exam. DO NOT LET YOUR EYES WANDER FROM YOUR EXAM! If you violate the code of academic integrity, you will be subject to sanctions such as loss of credit for this exam and possibly being assigned a failing grade for the course. 1. Which of the following describes the first law of thermodynamics? a. The entropy of the universe is constantly increasing. b. Energy cannot be transferred or transformed. *c. Energy cannot be created or destroyed. d. A change in entropy is affected by the temperature. e. At absolute zero, there is no change in entropy. 2. Which of the following statements describes the laws of thermodynamics as they apply to living organisms? a. The energy content of an organism remains constant throughout its life. *b. Because entropy is constantly increasing in cells, the organism must continuously supply energy to maintain itself. c. The second law of thermodynamics does not apply to living organisms. d. The entropy of an organism declines as the organism grows in complexity. 3. What explains the evolution of multiple enzymatic steps in glycolysis and the Krebs cycle, rather than a single reaction that converts glucose into carbon dioxide and water? a. Enzymes are typically able to perform single rather than multiple modifications of substrates. b. With multiple enzymes more heat can be released from the reaction. c. The multi-enzyme approach more effectively captures the potential energy of glucose. d. a and b *e. a and c
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4. Which of the following statements is (are) true about enzyme-catalyzed reactions? * a. The reaction is faster when an enzyme is involved. b. The amount of free energy released is greater when an enzyme is involved. c. An enzyme catalyzed reaction is always exergonic, releasing free energy. d. All of the above are true. e. None of the above are true. 5.
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This note was uploaded on 03/19/2011 for the course MCB 181R taught by Professor Leonard during the Spring '08 term at Arizona.

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Exam 2 Version 1 Key - Biology 181R Sections 5 6H Brian...

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