Which of the following are a diamino and dicarboxylic amino acid?

Cystine

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Lysine

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Cysteine

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Aspartic acid

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Solution

The correct option is B Cystine
Cystine is a sulfur-containing amino acid. It has two carboxylic acid groups and two amino groups. Hence it is di-amino, di-carboxylic amino acid. Thus the correct answer is option A.

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