I am given an unknown sample of an amino acid. On testing it, I find that its R group is polar, and contains a benzene ring. It is most likely to be:  a. Threonine b. Phenylalanine c. Tryptophan d. Histidine e. Tyrosine

Chemistry: An Atoms First Approach
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Chapter21: Organic And Biological Molecules
Section: Chapter Questions
Problem 91E
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I am given an unknown sample of an amino acid. On testing it, I find that its R group is polar, and contains a benzene ring. It is most likely to be: 

a. Threonine
b. Phenylalanine
c. Tryptophan
d. Histidine
e. Tyrosine
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