Simplest amino acid is

Glycine

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Leucine

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Lysine

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Valine

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Solution

The correct option is A Glycine
The simplest and smallest amino acid found in proteins is glycine. Glycine is the amino acid that has a single hydrogen atom as its side chain. The chemical formula of glycine is NH $_{2}$ ‐CH $_{2}$ ‐COOH. Glycine is one of the proteinogenic amino acids.
So, the correct answer is 'Glycine'.

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