153A_MIDTERM__W04_KEY

153A_MIDTERM__W04_KEY - Seat # _ Last initial _ Chemistry...

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Seat # ________ Last initial ________ Chemistry and Biochemistry 153A Winter 2004 Midterm Examination KEY Question # Value Score 1 31 2 34 3 33 4 28 5 26 TOTAL 152 ____________ KEY __________________ Print your full name ( last name first) ______________________________ Student ID Number ______________________________ Print your TA's name ______________________________ Discussion section # [or time & day] I have read the instructions below. ______________________________ Signature INSTRUCTIONS READ EACH QUESTION CAREFULLY! SHOW YOUR CALCULATIONS! WRITE YOUR LAST NAME IN THE SPACE PROVIDED ON EVERY PAGE OF THE EXAM. NO CREDIT WILL BE GIVEN FOR ANYTHING WRITTEN ON THE BACK OF A PAGE OR ANYWHERE OTHER THAN THE LINE OR SPACE PROVIDED FOR EACH ANSWER. ANSWERS MUST BE BRIEF AND TO THE POINT. WHERE A WORD LIMIT IS SPECIFIED AND THAT LIMIT IS SIGNIFICANTLY EXCEEDED, NO CREDIT WILL BE GIVEN FOR THE PART OF THE ANSWER IN EXCESS OF THE LIMIT. Numbers in parentheses represent the point values.
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Name _______ KEY ________________ 2 1. (31) a. (7) Indicate which of the following statements are correct by writing the numbers of all correct statements on the line provided. __ 2,3,4,6 ____ 1) The high surface tension of water is what makes life, as we know it, possible. 2) Water is a very weak acid, and hydroxide ion is a very strong base. 3) Water is a very weak base, and hydronium ion is a very strong acid. 4) The electronic configuration around the oxygen atom contributes to the dipole moment of the water molecule. 5) The abundance of water on earth maximizes the variation in temperature on earth. 6) The fact that ice floats in water is a very remarkable phenomenon. 7) The weak electrostatic interactions between water molecules are most properly referred to as ion-polar bonds. b. (11) 1) (2) As few as four simple classes of macromolecules can carry out a relatively large number of diverse functions. This contributes to the “_ economy __ of nature”. Efficiency - OK 2) (9) List examples of at least two specific functions for each of the three classes of macromolecules that were discussed in class. (Do not answer in narrative form. Simply list the class and functions by names or brief phrases. CLASS OF MACROMOLECULES FUNCTIONS 1. (Any 2): enzymes (catalysis), structure, Motility, etc. 1. Protein 2. transport, receptors, protection, antibodies, antigens etc. 1. structural support or protection 2. Polysaccharides 2. Energy storage 1.(Any 2):long-term energy storage in animals or seeds, protection 3. Lipids 2. protection, membrane components c. (5) Indicate which of the following statements about the hydrophobic effect are false by writing the numbers of all false statements on the line provided. _ 3, 5 ____ 1) The hydrophobic effect involves a negative free energy change for the system (i.e., G < 0) 2) The hydrophobic effect involves an increase in total entropy of the system. 3) The hydrophobic effect results from a strong attraction between nonpolar molecules or functional groups in aqueous solution.
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This note was uploaded on 04/10/2008 for the course CHEM 153A taught by Professor Staff during the Spring '05 term at UCLA.

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153A_MIDTERM__W04_KEY - Seat # _ Last initial _ Chemistry...

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