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Byju's Answer
Standard XII
Biology
Role of Ca, Mg and S
Which one is ...
Question

Which one is diaminodicarboxylic amino acid?

A
Cystine
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B
Lysine
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C
Cysteine
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D
Aspartic acid
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Solution

The correct option is A Cystine
Cystine contains two carboxylic groups and two amino groups because it is formed by two units of amino acids. Hence, cystine is diamino dicarboxylic amino acid.

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