HW1_bis102

HW1_bis102 - 1 of 2 Biological Sciences 102 Fall 2011 K...

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1 of 2 Biological Sciences 102 Fall, 2011 K. Hilt Homework #1 Learn the structures and one-letter codes of the twenty amino acids. Assigned problems in Biochemical Calculations (Segel), concerning weak acid/base concepts: Example 1 13 on page 18 #17, 24, 25 (a d), 29, 31, 32, 34, 36, 38 (a, d, j), 40, and 41 on pages 92 and 93. See appendix IV of Biochemical Calculations for pK a values needed in some of the above questions. For the questions below, use the following pK a values for the amino acids: -COOH (2.1), -NH 3 + (9.6); side chains---see the class handout on amino acid structures For oligopeptides, pK a values are: N-terminus (7.4), C-terminus (3.6) 1. Which amino acid has a net charge of “+ 0.09” at pH 7? Show all calculations. Draw the structure of the amino acid that would predominate at this pH. 2. Palmitate is a sixteen - carbon fatty acid. We will study it further when we study lipids, later in the course. When palmitate is put into water, the following reaction occurs spontaneously: H 3 C COO (symbol) excess H 2 O micelle palmitate H 2 O H 2 O H 2 O a) Which weak bond(s) stabilize the formation of the micelle? Explain. b) Which weak bond(s) destabilize the formation of the micelle? Explain.
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HW1_bis102 - 1 of 2 Biological Sciences 102 Fall 2011 K...

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