BIBCF09PS1KEY

BIBCF09PS1KEY - Problem Set 1 for BIBC 100 KEY Compound...

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Problem Set 1 for BIBC 100 KEY Compound pK 1 pK 2 pK R pI Glycine 2.34 9.60 5.97 Glutamate 2.19 9.67 4.25 3.22 Arginine 2.17 9.04 12.48 10.76 1a) What do the pK values tell you? A: It is the pH at which you find equal concentrations of the proton donor and proton acceptor group being titrated. b) Will the following amino acids have an overall positive, negative or zero charge at pH 3.22, pH 5.97, pH 10.76? pH 3.22 pH 5.97 pH 10.76 Gycine + Zero - Glutamate zero - - Arginine + + zero 2. Calculate the net charge on the following tripeptides at pH7. a) Asp-Glu-Ser -2 b) Ser- Gly-Thr 0 c) Gly–Lys-Arg +2 Note for answer: remember that once amino acids are joined as peptides, the only free amino and carboxyl groups will be at the ends of the peptide, one positive and one negative, balancing each other out to form a net zero charge. Therefore, the only charges one has to consider are those of the R side chains.
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3. Refer to Table 3-2 in the textbook for this question: a) How many proteins in the table exhibit quarternary structure? How can you tell?
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BIBCF09PS1KEY - Problem Set 1 for BIBC 100 KEY Compound...

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