BIO 250 - Exam 1 - 2003

BIO 250 - Exam 1 - 2003 - BIOCHEMISTRY 250 FIRST...

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BIOCHEMISTRY 250 FIRST EXAMINATION Friday, October 3, 2003 This exam is worth 100 points (2 pts/min) GOOD LUCK ________________________________________________________________________ 1. _________________ 8     7. _____________________ 8 2. _________________ 6     8. _____________________ 8 3. _________________10     9. _____________________ 6 4. _________________11     10. ____________________11 5. _________________12     11. ____________________10 6. _________________10     extra credit ______________ 4 TOTAL _____________________/100 8 pts 1. Define the following terms in one or two sentences (at most): (a) Amphipathic (b) Endergonic reaction (c) Quaternary structure (d) Ramachandran plot 6 pts 2. Without a calculator, determine what the factor difference in hydrogen ion concentration is: a) between a solution at pH 6.2 and one at pH 6.8?
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b) between two solutions that differ by 1.3 pH units? c) If two solutions differ from one another in [H + ] by a factor of 8, by how many pH units do they differ from one another? Show your work. 10 pts 3. The dissociation constant for a novel weak acid, HQ, is 4 x 10 -6 . a) What is the approximate pK a of this acid? b) If you make a 0.01 M solution of HQ in water, what fraction (or percent) of the HQ molecules will be dissociated? Show your work. c) What will be the approximate pH of this solution? d) What will happen to the pH of this solution if you dilute it 100-fold?
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BIO 250 - Exam 1 - 2003 - BIOCHEMISTRY 250 FIRST...

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