classes_spring08_153A-1ID29_080403_PracticeQ

classes_spring08_153A-1ID29_080403_PracticeQ - 5. Consider...

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1. List the four most common elements found in the human body (1 pt each). ______ ______ ______ _______ 2. The building blocks of proteins are (circle the one best answer) (2 pt): a) amino acids b) nucleic acids c) monosaccharides d) enzymes e) DNA f) unknown 3. Relatively, which molecule or structure is the smallest in mass (circle the one best answer) (2 pt): a) ribosome b) tryptophan c) carbon dioxide d) acetic acid e) none, all of these are about the same size 4. Fill in the blanks (3 pts): The number of common amino acids found in nature is ______. Two amino acids may form a dipeptide by making a specific bond called a(n) _____________ bond. This type of bond formation involves the __________(loss, gain) of one molecule of water.
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Unformatted text preview: 5. Consider an aqueous solution of the weak electrolyte imidazole. This particular solution predominantly contains imidazole in its unprotonated form. The pH of this solution must then be (circle the one best answer) (2 pt): a) < pKa of imidazole b) > pKa of imidazole c) = pKa of imidazole d) = 7.0 e) impossible to measure since the pH varies at all times for a buffer 6. Draw one molecule of the amino acid Cys at pH 7 in the box below. (Hint: At this pH its alpha amino group is in its protonated form and its alpha carboxyl group is in its deprotonated form, so be sure to draw it correctly.) Also, distinguish its R group from the other functional groups by clearly circling only the R group. (5 pts)....
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