A basic amino acid is

Leucine

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Methionine

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Aspartic acid

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Lysine

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Solution

The correct option is D Lysine
Lysine is basic amino acid because it has basic side chains at neutral pH. It has an isoelectric pH of 7. It has polar end NH $^{3 +}$ which helps in the formation of ionic bond with acidic amino acids. Histidine and arginine are other basic amino acid.
So, the correct answer is option D.

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