Below are seven amino acids. Indicate all characteristics that apply to each amino acid by writing letter(s) in the blanks provided. Amino acid: lysine ______ arginine ______ proline ______ aspartic acid ______ tryptophan ______ methionine ______ Characteristics: a) forms disulfide bonds b) R group is charged at pH=7.4 (the pH of most of the cell) c) non-polar/hydrophobic d) ring of side chain covalently linked to peptide backbone e) has a ring f) contains sulfur g) polar/hydrophilic
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