Bio124S07Exam1Sln

Bio124S07Exam1Sln - Bio124-01, 02 1. Exam 1 Feb. 22, 2007....

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Bio124-01, 02 Exam 1 Feb. 22, 2007. 100 points. 1. Organisms such as human contain this element only in trace amounts, therefore it is a trace element. A. Oxygen. B. Hydrogen. C. Carbon. D. Nitrogen. E. Iodine. 2. Polar compounds undergo attractive interaction only at the poles that A. are charged. B. have the same charges. C. are fully charged. D. have opposite charges. E. are not charged. 3. This (these) types of interaction(s) form molecules. A. Hydrophobic. B. H-bonding. C. Ionic (electrostatic). D. Covalent. E. Repulsive. 4. Steam (gaseous water) can take up much volume because A. inter-water H-bonds are dissociated. B. inter-water H-bonds are fixed. C. inter-water H-bonds continue to dissociate and reform. D. duh, steam is solid. 5. This property of water enables liquid water to form droplets rather than spread out thinly. A. Cohesiveness. B. Ability to act as solvent. C. Ability to dissociate into H + and OH - . D. High specific heat. 6. In addition to being polar, water molecules may undergo full dissociation, yielding A. a negative charge. B. a positive charge. C. both A and B. D. a partial negative charge. E. a partial positive charge. The negative charge from the OH - , the positive charge from the H + . 7. Buffers A. release H + when the pH is high. B. absorb H + when the pH is high. C. release H + . D. absorb H + . E. have no effect on pH. H + concentration is low when the pH is high. The weak acid dissociates to increase H + concentration. 8. The following figure is this type of a functional group. (The connecting bonds are not shown here.) A.Hydroxyl. B. Carbonyl. C. Carboxyl. D.Amino. E. Phosphate. O C OH
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9. The H in the figure above is A.Fully negatively charged. B. Partially negatively charged. C. Uncharged. D. Partially positively charged. E. Fully positively charged. Because the H is bonded to O, uneven sharing of electron leaves the H with a partial positive charge. 10. In addition to hydroxyl functional groups, the molecule below also contains this group. A.Hydroxyl. B. Carbonyl. C. Carboxyl. D.Amino.
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This note was uploaded on 04/08/2008 for the course BIO 124 taught by Professor Idk during the Fall '05 term at Bradley.

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Bio124S07Exam1Sln - Bio124-01, 02 1. Exam 1 Feb. 22, 2007....

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