153A_MIDTERM__F03_KEY

153A_MIDTERM__F03_KEY - Seat # _ Last initial _ Chemistry...

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Seat # ________ Last initial ________ Chemistry and Biochemistry 153A Fall 2003 Midterm Examination Question # Value Score 1 28 2 30 3 18 4 16 5 22 6 18 7 20 TOTAL 152 ______________________________ 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. (28) a. (7) Indicate which of the following factors contribute to (i.e., help to cause) the significant cohesiveness of water by writing the numbers of all contributing factors on this line. __ 2, 4, 7 ______ 1) The difference between the density of ice and water 2) The polar nature of the O-H bond 3) The small size of the water molecule 4) The electronic configuration around the oxygen atom 5) The abundance of water on earth 6) The high surface tension of water 7) Multiple weak electrostatic interactions between water molecules b. (6) Indicate which of the following factors contribute to the complexity of biological systems by writing the numbers of all contributing factors on this line. __ 2, 4 _ Indicate which of the following factors contribute to the simplicity or economy of biological systems by writing the numbers of all contributing factors on this line. __ 1, 3, 5, 6 _____ 1) The composition of macromolecules as polymers of similar or identical subunits 2) The large number of different macromolecules 3) The multiplicity of functions served by each type of macromolecule 4) The large size of macromolecules 5) The similarity among many diverse organisms in terms of macromolecular structure and function 6) The stereospecificity of biological reactions and biological compounds c. (5) In the following statements, circle the applicable terms from the choices appearing in bold type. Living systems (are or are not ) at equilibrium. A constant supply of energy to living organisms enables them to maintain ( low or high) entropy. An organism is a (static or dynamic ) system carrying out a (small or large ) number of chemical reactions at any given moment. Organisms can often maintain constant concentrations of biological molecules even while producing them and consuming them. This condition of constant concentrations in living organisms is known as __ steady-state _______. d. (1) If the pk a of a weak acid is 8, what is the acid dissociation constant for that weak acid? __ 10 - 8 ________________ e. (3) If the pH of a solution is 7, and the pk a of a weak acid dissolved in that solution is 5, what is the ratio of the conjugate base to the protonated weak acid? _ 100:1 __ What is the fractional concentration of the conjugate base?
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153A_MIDTERM__F03_KEY - Seat # _ Last initial _ Chemistry...

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