BIBC100midtermkeyWI08

BIBC100midtermkeyWI08 - NAME:_ STUDENT ID #:_ Multiple...

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NAME:_____________________________ STUDENT ID #:______________________________ Multiple choice. Select the ONE best answer for each question. Two points each. 1. Which of these statements about hydrogen bonds is not true? A) Hydrogen bonds account for the anomalously high boiling point of water. B) In liquid water, the average water molecule forms hydrogen bonds with three to four other water molecules. C) Individual hydrogen bonds are much weaker than covalent bonds. D) Individual hydrogen bonds in liquid water exist for many seconds and sometimes for minutes. E) The strength of a hydrogen bond depends on the linearity of the three atoms involved in the bond. 2. Hydrophobic interactions make important energetic contributions to: A) binding of a hormone to its receptor protein. B) enzyme-substrate interactions. C) membrane structure. D) three-dimensional folding of a polypeptide chain. E) all of the above are true. 3. The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. The blood sample has: A) 0.189 times the [H + ] as the gastric juice. B) 5.29 times lower [H + ] than the gastric juice. C) 6 times lower [H + ] than the gastric juice. D) 6,000 times lower [H + ] than the gastric juice. E) a million times lower [H + ] than the gastric juice. 4. The chirality of an amino acid results from the fact that its α carbon: A) has no net charge. B) is a carboxylic acid. C) is bonded to four different chemical groups. D) is in the L absolute configuration in naturally occurring proteins. E) is symmetric. 5. Two amino acids paired below both contain hydroxyl groups. They are: A) cysteine and serine. B) cysteine and threonine. C) methionine and cysteine D) methionine and serine E) threonine and serine.
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NAME:_____________________________ STUDENT ID #:______________________________ 6. All of the amino acids that are found in proteins, except for proline, contain a(n): A) amino group. B) carbonyl group. C) carboxyl group. D) ester group. E) thiol group. 7. Titration of valine by a strong base, for example NaOH, reveals two p K ’s. The titration reaction occurring at p K 2 (p K 2 = 9.62) is: A) —COOH + OH —COO + H 2 O. B) —COOH + —NH 2 —COO + —NH 2 + . C) —COO + —NH 2 + —COOH + —NH 2 . D) —NH 3 + + OH —NH 2 + H 2 O. E) —NH 2 + OH —NH + H 2 O. 8. In a highly basic solution, pH = 13, the dominant form of glycine is: A) NH 2 —CH 2 —COOH B) NH 2 —CH 2 —COO - C) NH 2 —CH 3 + —COO - D) NH 3 + —CH 2 —COOH. E) NH 3 + —CH 2 —COO - 9. For amino acids with neutral R groups, at any pH below the pI of the amino acid, the population of amino acids in solution will have: A) a net negative charge. B)
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BIBC100midtermkeyWI08 - NAME:_ STUDENT ID #:_ Multiple...

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