All the following amino acids are essential except:

Cysteine

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Threonine

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Alanine

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Lysine

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Solution

The correct option is A
Cysteine

Cysteine can be synthesized de novo from methionine and serine and is, therefore, a nonessential amino acid in human adults. Several studies have suggested that cysteine might be a conditionally essential amino acid in preterm infants because of biochemical immaturity.

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All the following amino acids are non essential except:

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