7.2. Brønsted–Lowry theory of acids and bases
A subsection of Chemistry, 9701, through 7. Equilibria
Listing 10 of 133 questions
Use the Data Booklet to draw the structure of the dipeptide val-lys. The peptide bond should be shown displayed.  The isoelectric point is the pH at which an amino acid exists as a zwitterion. The isoelectric point of valine is 6.0 and of lysine is 9.8. A mixture of the dipeptide, val-lys, and its two constituent amino acids, valine and lysine, was analysed by electrophoresis using a buffer at pH 6.0. Draw and label three spots on the diagram of the electrophoresis paper to indicate the likely position of each of these three species after electrophoresis. Explain your answer. + – mixture applied here explanation  
9701_w18_qp_41
THEORY
2018
Paper 4, Variant 1
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Use the Data Booklet to draw the structure of the dipeptide val-lys. The peptide bond should be shown displayed.  The isoelectric point is the pH at which an amino acid exists as a zwitterion. The isoelectric point of valine is 6.0 and of lysine is 9.8. A mixture of the dipeptide, val-lys, and its two constituent amino acids, valine and lysine, was analysed by electrophoresis using a buffer at pH 6.0. Draw and label three spots on the diagram of the electrophoresis paper to indicate the likely position of each of these three species after electrophoresis. Explain your answer. + – mixture applied here explanation  
9701_w18_qp_43
THEORY
2018
Paper 4, Variant 3
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Questions Discovered
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