The amino acid which has a non-polar side chain is :

alanine

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lysine

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aspartic acid

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serine

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Solution

The correct option is A alanine
Side chain of lysine: $H_{2} N - (C H_{2})_{4} -$
Side chain of serine: $H O - C H_{2} -$
Side chain of aspartic acid: $H O O C - C H_{2} -$
Side chain of alanine: $- C H_{3}$
Among these, alanine has a non-polar side chain. Its side chain is $- C H_{3}$ which is a non-polar hydrocarbon only.

Hence, (d) is correct.

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