Chemistry, 21.07.2020 18:01 kingmichael2xx
A) The pK1, pK2, and pKR for the amino acid histidine are 1.8, 9.3, and 6.0, respectively. At pH 4.0 would be charged predominantly as follows:
A. a-carboxylate 0, a-amino +1, imidazole +1, net charge +2
B. a-carboxylate +1, a-amino +1, imidazole β1, net charge +1
C. a-carboxylate β1, a-amino +1, imidazole 0, net charge 0
D. a-carboxylate +1, a-amino 0, imidazole β1, net charge 0
E. a-carboxylate β1, a-amino +1, imidazole +1, net charge +1
b) The pK1, pK2, and pKR for the amino acid arginine are 1.8, 9.0, and 12.5, respectively. At pH 7.0 arginine would be charged predominantly as follows:
A. a-carboxylate +1, a-amino 0, guanidino -1, net charge 0
B. a-carboxylate 0, a-amino 0, guanidino +1, net charge +1
C. a-carboxylate β1, a-amino +1, guanidino +1, net charge +1
D. a-carboxylate β1, a-amino 0, guanidino +1, net charge 0
E. a-carboxylate +1, a-amino β1, guanidino β1, net charge β1
c) The pK1, pK2, and pKR for the amino acid aspartic acid are 2.0, 9.9, and 3.9, respectively. At pH 7.0, aspartic acid would be charged predominantly as follows:
A. a-carboxylate +1, a-amino +1, b-carboxylate +1, net charge +3
B. a-carboxylate 0, a-amino +1, b-carboxylate 0, net charge +1
C. a-carboxylate 0, a-amino β1, b-carboxylate 0, net charge β1
D. a-carboxylate +1, a-amino β1, b-carboxylate +1, net charge +1
E. a-carboxylate β1, a-amino +1, b-carboxylate β1, net charge β1
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A) The pK1, pK2, and pKR for the amino acid histidine are 1.8, 9.3, and 6.0, respectively. At pH 4.0...
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