old_final 98 - Seat Chemistry 153A Section 2 Fall 98 Final...

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Seat # ______ Chemistry 153A Section 2 Fall 98 Final Exam Question # Value Score 1 20 2 6 3 6 4 10 5 4 6 15 7 15 8 16 9 5 10 18 11 15 12 25 13 25 14 20 15 20 16 15 17 15 TOTAL 250 TOTAL COURSE SCORE FINAL COURSE GRADE Gas constant: R=1.98 x 10 -3 kcal/ o K/mole R= 8.31 x 10 -3 kJ/ o K/mole Faraday’s constant: 23 kcal V -1 mol -1 96.5 kJ V -1 mol -1 1
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Name______ KEY______ _____________________ page 2 First letter of your last name _____ _________ KEY ________________ Print your full name (Last Name First) ______________________________ Print your TA's name ______________________________ Time and day of your discussion section 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 IN A SPACE OTHER THAN THAT PROVIDED FOR YOUR ANSWER. ANSWERS MUST BE BRIEF AND TO THE POINT. WHERE WORD LIMITS ARE GIVEN, NO CREDIT WILL BE GIVEN FOR THE PART OF YOUR ANSWER THAT SIGNIFICANTLY EXCEEDS THAT LIMIT. Numbers in parentheses represent the point values.
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Name______ KEY______ _____________________ page 3 1. (20) a. The properties of life include self-replication, catalysis, and mutability. Two examples of mutability in life are _ differentiation, growth ____ and _ evolution _______. [any two] b. Which of the four classes of macromolecules is most complex in molecular structure, but smallest in molecular size. __ lipids _________________ c. The Henderson-Hasselbalch Equation relates the pK a of a weak acid to its degree of ___ ionization ______ at a particular __ pH ______. e. If a weak acid is dissolved in a solution at a pH that is lower than its pK a by one pH unit or less, the addition of hydroxide ion to the solution will result in increased ionization or deprotonation _ of the weak acid. This will tend to minimize the change in the __ pH _ of the solution. f. Circle the name of the amino acid whose side chain has the lowest the pK a of the three. Lysine Tyrosine Cysteine g. Three of the four types of weak interactions that stabilize protein native conformation actually have the same basis of interaction, but differ in specificity or degree. Which of the four weak interactions has a strikingly different basis? ___ hydrophobic effect ________________ h. Would you expect silk protein (ala-gly) n consisting entirely of stacked 5-strand β− meanders (anti- parallel β -pleated sheets whose strands are connected by β− bends), to be disrupted by placing it in an organic solvent? __ No ___ Justify your answer. [ 50 words] The hydrogen bonds stabilizing the beta structure are stronger in an apolar solvent, and the interaction of any exposed side chains of ala and gly with the organic solvent would not be disfavored. i. Classify the following amino acids as a ) strongly hydrophilic, b ) weakly hydrophilic, c ) weakly hydrophobic, or d ) strongly hydrophobic by writing the corresponding letter on the line provided. __ c _ alanine __ a glutamine __ c _ methionine _ b __ serine __ d _ valine _ a __ lysine
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Name______ KEY______ _____________________ page 4 2.
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