Amino and an R group.

Amino acids are protein building blocks. They are made of an amino group or carboxyl group and an R group. Amino acids that attach to one another in a form of a chain, form  a polypeptide.

There are 20  amino acids that occur naturally, as well as naturally occurring carboxylic acid groups. These amino acids are simple  monomers and serve as parts to makeup proteins. Each amino acid consists of  a central asymmetric carbon, a hydrogen atom, and a side chain (R group).  Each human body has ten essential amino acids that can be obtained from dietary sources. Interestingly,essential  amino acids can not be synthesized by the body. Some examples of essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Human body is capable of synthesizing  nonessential amino acids which are Alanine, Asparagine, Aspartic acid, and Glutamic acid.  Conditional amino acids are not essential for normal daily function but they become highly necessary when the body is stressed or battling an illness .

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The conditional amino acids are Arginine, Cysteine, Glutamine, Tyrosine, Glycine, Ornithine, Proline, serine.