For the amino acids with only two charged groups the isoelectric point is the halfway point between them which makes perfect sense to me. In other words the glycine would be neutral at this pHSometimes a compound has more than two groups with pKa values. Pka Amino Acids Table Amino Acids Study Tips College Biochemistry Your confusion seems to stem from choosing the relevant p K a values. . Isoelectric point w 3 pkas question I read somewhere you take the two closest pkas and average them and that kind of made sense for this answer choice but I got it wrong. Lets say glutamate glutamate has 3 ionizable groups NH3 COOH carboxy terminal end and COOH of the R group because i dont have them memorized lets just say NH3 pka 10 COOH carboxy 31 COOH R group 41. Mathematically it is defined as the mean of the pKa values for a molecule. Click cc on the bottom right for video transcript This is video 6 in the Amino Acids Series. PI is...
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