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Answer #1

Serine is a non essential amino acid with a small side chain. Serine is optically active compound. The hydroxyl group in serine side chain is very active and it can form hydrogen bonds very easily. Serine because of its ionizable side chain can participate in salt bridge interactions. So, all of these options are wrong.

Serine can exist in both polar and non polar environment because if it's relatively small side chain. So, the answer for this question is option 3.

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