BCH210H1 : sg___
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BCH210H1 Full Course Notes
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Biochemistry 210 practice midterm: at physiological ph (7. 4) the peptide tyr-tyr-lys-leu-pro-gly-gly-leu-glu-met-ser-ser- Trp-pro-val-phe-tyr-lys-his-arg-thr-thr-val-val-leuhas an overall charge of: -1, 0, +2, +3. Answer: c: in the ,-helical peptide: ala-ser-phe-lys-pro-ile-trp-leu-asp-met-thr-try-ile, the amide. N-h proton of the trp residue is h-bonded to the backbone carbonyl oxygen atom of: phe, thr, met, lys. Answer: a: the tertiary structure of many globular proteins contains extensive unstructured or random regions. Answer: a: at physiological ph (7. 4), if a 20-residue peptide contains one each of 20 commonly occurring amino acids, the net charge is, 0, +2, -2, -1. Answer: c: primary sequence determines secondary structure. Prep101 http://www. prep101. com/freestuff: proteins fold to their native structures in orders-of-magnitude less time than they would if the protein folded randomly. Which two of the following events describe the directed nature of protein folding? (i) (ii) (iii) (iv) hydrogen bond formation between two short segments having --sheet structure. Short segments of ,-helices in freshly synthesized protein chain interact.
