All of the following are essential amino acids except
A
Leucine
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B
Isoleucine
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C
Threonine
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D
Tyrosine
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Solution
The correct option is C Tyrosine An essential amino acidis an amino acid that cannot be synthesised by the organism being considered, and therefore must be supplied in its diet. The nine amino acids humans cannot synthesise are phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine and histidine.