Quiz 1 key - charge. Only molecules with multiple charged...

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Biochemistry 309, Winter 2010 Quiz #1 NAME: ______________________________________________ 1. What is the pH of a 0.1M HCl solution? (2 points) pH = -log [H+] = -log (0.1) = -log (10 -1 ) = 1 2. Define the pKa of an acid. (2 points) The pKa of an acid is the –log of the equilibrium constant of the acid. Ka = [H+][A-] pKa = -log ([H+][A-] ) [HA] [HA] 3. List two atoms to which hydrogen bonds in biology. (2 points) Hydrogen bonding can occur to nitrogen and oxygen. 4. Define pI. Does every molecule have a pI? (4 points) The pI of a molecule is the pH at which the molecule has no net
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Unformatted text preview: charge. Only molecules with multiple charged groups with different pKas will have a PI. Uncharged molecules or those with only one or one type of ionizable group will not have a unique pI. 5. List four categories of amino acids and provide one example for each class. (8 points) hydrophobic/aliphatic/non-polar: A, I, L, V, M aromatic: Y, F, T negatively charged: E, D positively charged: K, R, H polar, uncharged: S, T, C, N, Q 6. Which amino acid is not chiral? Why not? (2 points) Glycine is not chiral because it is not bound to four different groups....
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