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.


Answer
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 . leucine . lysine . methionine . phenylalanine . threonine . tryptophan . valine . histidine Five (MORE)

Examples of essential amino acid?

Essential amino acids cannot be made by the body, so they must be taken in as nutrients. These include leucine, isoleucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine and histidine.

What are essential amino acids?

An amino acid that cannot be synthesised by an organism and therefore must be supplied by the diet is called an essential amino acid. Humans can produce 12 of the 20 amino acids. The others must be supplied in the food. These are called essential amino acids. The body also doesn't store the excess a (MORE)

How many essential amino acids are there?

There are nine essential amino acids for humans (histadine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine) that must come from your food.

List of 20 essential amino acids?

http://www.fr33.net/aminoacids.php I think there's like, 8 essential amino acids but 20 standard amino acids. Always got confused on that.

What are Non-essential amino acids?

About half way down this page you will get a list of them and the roles they play in our systems: http://www.realtime.net/anr/aminoacd.html

What is the difference between essential and non-essential amino acids?

Essential amino acids are those the body cannot produce. There are 20 basic amino acids. There are eight essential amino acids unless the individual is a phenylketonuric. There are nine essential amino acids for phenylketonurics as they cannot convert phenylalanine to tyrosine. Essential amino acids (MORE)

Why 8 essential amino acid called essential?

There are a number of characteristics that make something "essential" not just the fact that it is needed by the body, although that is the first. The second is that it must only be available from the diet, ie it must not be something that the organism can make itself form other things. It must also (MORE)

How do organisms obtain essential amino acids?

By eating certain types of proteins. Proteins are necessary in animals' diets, since animals cannot synthesize all the amino acids they need and must obtain essential amino acids from food. Apex Answer: eating certain types of proteins.

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.

How many amino acids are considered essential?

An article published in the Journal of Nutrition states, "The amino acids regarded as essential for humans are phenylalanine , valine , threonine , tryptophan , isoleucine , methionine , leucine , lysine , and hist idine ." -Wikipedia- Essential (MORE)

Why are some amino acids considered essential?

The eight essential amino acids are considered essential because they must be a part of our diet. They are the only amino acids our cells cannot create on there own. The other 12 can be synthesized from other molecules.

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 acid, glycine+alanine, proline, serine, arginine

How do vegetarians get essential amino acids?

All unrefined, plant-based foods have varying amounts of protein with varying amino acid profiles, including leafy green vegetables, tubers, grains, legumes, and nuts. All the essential and nonessential amino acids are present in any single one of these foods in amounts that meet or exceed your need (MORE)

What are those amino acids that are not essentials?

These are known as non-essential amino acids because they can be produced by the organism. As for which amino acids are essential and non-essential varies per organism. Many bacteria can synthesize all amino acids and therefore all are non-essential.

What are the formulas for the 8 essential amino acids?

Valine: HO 2 CCH(NH 2 )CH(CH 3 ) 2 Tryptophan: C 11 H 12 N 2 O 2 Threonine: HO 2 CCH(NH 2 )CH(OH)CH 3 Phenylalanine: HO 2 CCH(NH 2 )CH 2 C 6 H 5 Methionine: HO 2 CCH(NH 2 )CH 2 CH 2 SCH 3 Lysine: HO 2 CCH(NH 2 )(CH 2 ) 4 NH 2 Leucine: HO 2 CCH(NH 2 )CH 2 CH(CH 3 ) 2 Isoleucine: HO 2 CC (MORE)

Why are essential amino acids called essential?

The phrase means that they are essential in the diet , because the body cannot produce them internally from other compounds. It should not be interpreted to mean that they are somehow more important than the others. Also, amino acids which are essential for some animals are not necessarily ess (MORE)

The nine essential amino acids are?

Actually there are 10 essential amino acids of which 2 are essentially only in children. The ten essential amino acids are:- . arginine . histidine . isoleucine . leucine . lysine . methionine . phenylalanine . threonine . tryptophan . valine Of these, arginine and histidine are essen (MORE)

How can vegetarians get the essential amino acids?

All unrefined, plant-based foods have varying amounts of protein with varying amino acid profiles, including leafy green vegetables, tubers, grains, legumes, and nuts. All the essential and nonessential amino acids are present in any single one of these foods in amounts that meet or exceed your need (MORE)

Are there 8 or 9 essential amino acids?

There are currently 9 essential amino acids. Histidine has recently been discovered to not be synthesized in adults, which raises the list to 9 essential amino acids in adults.

What are the Elements and the essential elements of amino acids?

Two Part Question: Regarding Elements: Take Carbohydrates [C and H and O] and add Nitrogen and we get amino acids which are the constituent building blocks of Proteins. The essential elements of amino-acids that comprise Proteins are i) the unique -C-C-N-C-C-N-C-C-N- [poly] - Peptide Bonds, and ii (MORE)

Which amino acid is classified as a conditionally essential amino acid?

The conditionally essential amino acids in humans are the amino acids arginine, cysteine, glycine, glutamine, histidine, proline, serine and tyrosine. They are considered conditionally essential, which means they are not normally required in the diet, but must be supplied as a supplement to specific (MORE)

How do essential amino acids differ from non-essential amino acids?

"Essential" amino acids are those that are essential in the diet.The body can make the others from simpler compounds. Which amino acids are "essential" depends on the species; they'renot the same for humans that they are for, say, cats. Other than that, there's no difference.

Essential amino acids-?

An essential amino acid or indispensable amino acid is an aminoacid that cannot be synthesized de novo (from scratch) by theorganism being considered.

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 produced from other amino acids and substances in the diet and metabolism.Here is way to remember them: "These Ten Valuable (MORE)