Question

At any pH below the pI of the amino acid glycine, it will have: Select one: a. A net positive charge b. A zero net charge. C. One fully positive and one fully negative charge D. its both carboxyl- and amino groups half dissociated

Answer 1

answer : A net positive charge

glycine :

pKa1= 2.34

pK_a2 = 9.6

pI = 5.97

below 5.97                                pH = 5.97                                      above 5.97

NH₃⁺-CH₂-COOH ----------------------> NH₃⁺-CH₂-COO^- ---------------> NH2 -CH₂-COO-