exam1 07 - NAME: _ MIDTERM EXAM I BIOLOGY 231 17 September...

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NAME: _______________________________ MIDTERM EXAM I BIOLOGY 231 17 September 2007 ________________________________________________________________________________ -1- GENERAL INSTRUCTIONS: 1. Answer all questions IN INK. 2. NO CALCULATORS. 3. Confine each answer to the BOX or SPACE provided. You are free to use the backs of the pages for scratch work, but ONLY what is written in the box or space will be graded! 4. SHOW YOUR WORK in all calculations. 5. Make sure that your name is PRINTED LEGIBLY on EACH PAGE. 6. This exam consists of 7 questions on 14 pages and it is worth a total of 100 points. Information that may be useful: < For the reaction A + B <==> C + D, Ä G = Ä G + RTln([C][D]/[A][B]) o and RTln(X) = 5.7 kJ/mol @ log(X) < At equilibrium, Ä G = 0 < log (10 ) = X; 10 = X X log(X) < surface of sphere = 4 ð r ; volume of sphere = 4/3 ð r ; area of circle = ð r ; surface of cube = 6e 23 2 2 < 1M = 10 mM = 10 ì M; 1 mole = 10 mmoles = 10 ì moles 36 3 6 < For an enzyme that obeys Michaelis-Menten kinetics, the relationship between V and [S] is: MAX V = V × OR, [S] M ([S] + K ) = + × M 1 1 K 1 V V V [S] < An amino acid has the following structure: < On this date in 1787, the US Constitution was signed in Philadelphia by 38 of the 41 delegates present. It is now the longest-standing, longest-observed written constitution in the world.
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NAME: _______________________________ MIDTERM EXAM I BIOLOGY 231 17 September 2007 ________________________________________________________________________________ -2- R groups of some amino acids: ala (A): asp (D): glu (E): gly (G): lys (K): arg (R): ser (S): tyr (Y): his (H): pK values of some amino acids amino acid pK of side chain or terminal group Alanine (ala or A) Uncharged Arginine (arg or R) 12.5 Asparagine (asn or N) Aspartic acid (asp or D) 3.9 Cysteine (cys or C) 8.3 Glutamic acid (glu or E) 4.3 Glycine (gly or G) Histidine (his or H) 6.0 Lysine (lys or K) 10.8 Phenylalanine (phe or F) Serine (ser or S) Tyrosine (tyr or Y) 10.9 Valine (val or V) peptide N terminus 7.8 peptide C terminus 3.6
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NAME: _______________________________ MIDTERM EXAM I BIOLOGY 231 17 September 2007 ________________________________________________________________________________ -3- (1) Consider a cell growing in liquid medium in a culture dish. In lecture, we looked at what happens when we add a small hydrophilic dye molecule to the medium surrounding the cell. After a while we can wash the dye out of the culture medium, and observe that dye has entered a compartment of the cell that we called the “endomembrane system.” (a) 2 pts In a sentence or two, EXPLAIN how dye got from the extracellular medium into the cell and then spread throughout the endomembrane system? (b) 2 pts
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This note was uploaded on 09/18/2011 for the course BIOLOGY 231 taught by Professor Petethollenbeck during the Fall '10 term at Purdue University-West Lafayette.

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exam1 07 - NAME: _ MIDTERM EXAM I BIOLOGY 231 17 September...

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