In the case of serine, threonine and tyrosine they have the -OH group in their residue. I'm wondering even though all of them has the -OH groups in their residue. but only the tyrosine has the pKa value with the -OH grouup.

Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter26: Biomolecules: Amino Acids, Peptides, And Proteins
Section26.SE: Something Extra
Problem 56AP: What is the structure of a nonapeptide that gives the following fragments when cleaved? Trypsin...
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In the case of serine, threonine and tyrosine they have the -OH group in their residue. I'm wondering even though all of them has the -OH groups in their residue. but only the tyrosine has the pKa value with the -OH grouup.
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