Chemistry
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 βˆ’1, net charge +1
C. a-carboxylate βˆ’1, a-amino +1, imidazole 0, net charge 0
D. a-carboxylate +1, a-amino 0, imidazole βˆ’1, net charge 0
E. a-carboxylate βˆ’1, 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 βˆ’1, a-amino +1, guanidino +1, net charge +1
D. a-carboxylate βˆ’1, a-amino 0, guanidino +1, net charge 0
E. a-carboxylate +1, a-amino βˆ’1, guanidino βˆ’1, net charge βˆ’1
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 βˆ’1, b-carboxylate 0, net charge βˆ’1
D. a-carboxylate +1, a-amino βˆ’1, b-carboxylate +1, net charge +1
E. a-carboxylate βˆ’1, a-amino +1, b-carboxylate βˆ’1, net charge βˆ’1

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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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