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Home Q & A Board Biology-Related Homework Help Biochemistry
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Broom Broom
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10 years ago
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) carboxylate +1, -amino 0, imidazole −1, net charge 0
b) carboxylate —1, -amino +1, imidazole 0, net charge 0
c) carboxylate +1, -amino +1, imidazole −1, net charge +1
d) carboxylate —1, -amino +1, imidazole +1, net charge +1
e) carboxylate 0, -amino +1, imidazole +1, net charge +2

Can someone please explain this to me?! I have no idea where to start.
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#1
Educator
7 years ago
alpha-carboxylate −1, alpha-amino +1, imidazole +1, net charge +1
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