bch3033sex1ans

bch3033sex1ans - These are some sample problems similar to...

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These are some sample problems similar to those that you will find on the exam. The exam consists of 30 multiple choice questions and 10 short answer questions. These are multiple choice mixed with short answer. 1. What functional groups are present on this molecule? CH 2 -CH 2 -CHO | OH A) hydroxyl and carboxylic acid B) hydroxyl and aldehyde C) hydroxyl and ketone D) ether and aldehyde E) hydroxyl and ester 2. A chemist working in a pharmaceutical lab synthesized a new drug as a racemic mixture. Why is it important that she separate the two enantiomers and test each for its biological activity? Each may exhibit distinct and different biological activity. 3. Which of these statements about hydrogen bonds is not true? A) Individual hydrogen bonds are much weaker than covalent bonds. B) Hydrogen bonds account for the anomalously high boiling point of water. C) Individual hydrogen bonds in aqueous water exist for many seconds and sometimes for minutes. D) In liquid water, the average water molecule forms hydrogen bonds with 3 to 4 other water molecules. 4. The hydrophobic effect makes an important energetic contribution to: A) membrane structure. B) protein tertiary structure. C) protein quartenary structure. D) enzyme-substrate interactions. E) all of the above. 5. The aqueous solution with the lowest pH is: A) 0.1 M HCl. B) 0.1 M acetic acid (pKa = 4.86). C) 0.1 M formic acid (pKa = 3.75). D) 10-13 M NaOH. 6. A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH: A) 7.58. B) 7.4. at pH=8.0 A/HA = 4/1 or 80mmols A / 20mmols HA C) 7.22. 30mmols of HCl will convert 30mmols of A to HA D) 6.8. this gives a final ratio of 50mmols/50mmols. pH=pK E) 6.53. 7. Explain the fact that ethanol (CH
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bch3033sex1ans - These are some sample problems similar to...

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