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What is an essential amino acid?

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An essential amino acid is a building block of protein molecules that our bodies cannot produce and need to get from a food source. They are essential because we can not synthesize them from other amino acids or smaller building blocks. Ultimately they are needed to make proteins which build tissues in our bodies.  
Protein molecules are long chains of amino acids. There are 20 naturally occurring amino acids used in protein synthesis alanine, asparagine, aspartic acid, glutamic acid, cysteine, glutamine, glycine, proline, serine, tyrosine, arginine and histidine are non essential in that they can be synthesized from precursors in the diet. The amino acids isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine can not be synthesised by the body and therefore must be essential components of the diet. However some of the nonessential amino acids listed above are essential for normal growth in children since they do not have full biosynthetic capability as they develop.

Amino acids which can't be synthesized by the body and must be taken in diet are known as essential amino acids.
Essential amino acids are required by animals yet they cannot be synthesized, they are usually supplied in the diet.
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What are the essential amino acids?

Essential amino acids An amino acid that must be obtained from the diet so that the body can synthesize vital proteins. The nine essential amino acids are: isoleucine leucin

Essential amino acids?

Are vital for protein synthesis and include lysine, isoluceine and valine.

Essential and non essential amino acids?

essential amino acids are those that we cannot produce while non-essential amino acids are those that we can produce by ourselves by nitrogen containing compounds in our body.

A non essential amino acid is?

an amino acid that the body can produce without supplementation and includes glycine, alanine, and serine

What are the 21 essential amino acids?

methionine, tryptophan, lysine, leucine, isoleucine, phenylalanine, valine, threonine, histidine, cysteine, tyrosine, total aromatics, total sulphured, aspartic acid, glutamic
In Science

Which amino acids are conditionally essential and why?

The human body uses 20 of the 100 amino acids found in nature.Essential amino acids are those that we have to eat and take in. Non-essential amino acids are those which can be