Which of the following is basic amino acid ?

Lysine

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Proline

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Alanine

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Aspartic acid

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Solution

The correct option is A Lysine
There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Hence option (a) is correct.

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