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Fall 06 - Seat Last initial Chemistry and Biochemistry 153A...

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Seat # ________ Last initial ________ Chemistry and Biochemistry 153A Fall 2006 Midterm Examination Question # Value Score 1 21 2 22 3 31 4 27 5 20 6 31 TOTAL 152 ____________ KEY ________________ Print your full name ( last name first) _____________________________________ Student ID Number _____________________________________ Print your TA's name ______________________________ Discussion section # [or time & day] INSTRUCTIONS YOU SHOULD HAVE ONLY YOUR WRITING MATERIALS, ERASER, APPROVED NON- PROGRAMMABLE, NON-GRAPHING CALCULATOR WITHOUT CASE OR COVER AND YOUR PICTURE I.D. ZIP EVERYTHING ELSE INSIDE YOUR BACKPACK AND STORE IT ALL THE WAY UNDER YOU CHAIR. NO OTHER ELECTRONIC DEVICES OR CELL PHONES ARE ALLOWED. NO BOOKS OR LOOSE PAPERS OF ANY KIND SHOULD BE IN THE VICINITY OF YOUR DESK. 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 SPACE PROVIDED FOR EACH ANSWER. ANSWERS MUST BE BRIEF AND TO THE POINT. WHERE A WORD LIMIT IS SPECIFIED, NO CREDIT WILL BE GIVEN FOR THE PART OF THE ANSWER IN EXCESS OF THE LIMIT. Numbers in parentheses represent point values. I have read & understood the instructions on this page. I do not have any prohibited materials in my possession. I will not give, solicit or take any help on this exam. ______________________________________ Signature
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Seat # ________ Last initial ________ 1. (21) a. 1) (1) How many classes of macromolecules are found in living systems? __ 4 ____ 2) (2) Macromolecules contribute greatly to the complexity of living cells as defined in the compendium. Very concisely state two reasons for this. [ 10 words each] a) They are extremely large. b) There are many different species of macromolecules in each cell. 3) (2) Although the statements in part (2) above are true, macromolecules also confer a degree of molecular simplicity on living systems, making the job of structural analysis by biochemists much easier than it would be otherwise. What structural characteristic, shared by all macromolecules, is largely responsible for this? [ 20 words] They are polymers of similar subunits. 4) (2) Considering the great diversity of life and the huge numbers of different organism on earth, what additional factor also contributes to a simplicity that makes biological studies at the molecular and chemical level easier? [ 20 words] Most organisms use the same or similar molecules and reaction pathways as nearly all other organisms to meet similar needs. 5) (2) Our cursory consideration of the many different types of functions to be carried out in a single organism has revealed to us that nature is very conservative in the use of resources by managing to adapt each class of macromolecules to a large number of diverse functions. The catch phrase we have used to describe this phenomenon is, “_ the economy of life &/or simplicity of life ”. b. (5) The expression for the equilibrium constant for the ionization of water is written as follows.
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