Which of the following is true about the polar aminoacids Serine, Threonine, and Tyrosine?

Question

BlackTom AI · Accepted Answer

This question asks which statement correctly describes the polar amino acids serine, threonine, and tyrosine.
Option 1: 'The amino group makes them hydrophilic' — While the amino group is indeed polar, it is a characteristic of all amino acids and does not specifically distinguish serine, threonine, and tyrosine. Hydrophilicity in these residues mainly arises from their side chain hydroxyl groups, not just the backbone amino group.
Option 2: 'The hydroxyl group makes them reactive' — This is accurate. Each of these amino acids contains a hydroxyl (-OH) group in its side chain, which participates in hydrogen bonding and can be involved in catalytic roles or post-translational modifications; that hydroxyl group imparts polarity and reactivity to the side chain.
Option 3: 'They are not building blocks of proteins' — This is false. Serine, threonine, and tyrosine are standard proteinogenic amino acids and are indeed common building blocks of proteins.
Option 4: 'They are mostly uncharged' — At physiological pH, serine and threonine side chains are neutral but polar; tyrosine has a phenolic OH that can donate a proton under certain conditions, giving nuanced pKa considerations. In general, labeling them as 'mostly uncharged' oversimplifies their chemistry and ignores their polar, hydrogen-bonding capacity. Therefore, this statement is misleading.
Thus, the statement that correctly captures a defining feature of these polar amino acids is that the hydroxyl group makes them reactive.

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Which of the following is true about the polar aminoacids Serine, Threonine, and Tyrosine?

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