Proteins are polymers of amino acids that provide structure and control reactions in all cells. When humans think of expressing the meaning of life, they often resort to words. From poems to sonnets to short stories to novels, words tell the stories of...

Proteins are large, organic, nitrogen-containing molecules that are essential both to the structure and to the function of all living cells. Exceedingly complex themselves, the protein molecules have as their structural units much simpler compounds...

In humans, there is a large amount of protein turnover. Approximately one pound of protein is degraded and re-synthesized each day. Most of the amino acids liberated by protein degradation are used again in the re-synthesis of new protein but about ten...

Proteins are large, organic, nitrogen-containing molecules that are essential both to the structure and to the function of all living cells. Exceedingly complex themselves, the protein molecules have as their structural units much simpler compounds...

Proteins are vital components of all forms of life, and are important to living cells both structurally and functionally. They are made up of amino acids linked together in a chain by a sequence of peptide bonds. A peptide bond links the amino group...

Any of numerous organic compounds, complex polymers of amino acids that are involved in nearly every aspect of the physiology and biochemistry of living organisms. Twenty different amino acids are common to proteins, linked in chains of hundreds to...

(from Greek, proteios: primary) A protein is a complex MOLECULE, composed of various combinations of any of the twenty AMINO ACIDS (each made of carbon, hydrogen, oxygen and nitrogen) with a side chain, usually containing sulphur and often phosphorous....

A naturally occurring POLYPEPTIDE comprising AMINO ACIDS with or without other groups. Proteins are one of the essential building blocks of animal life. They have a large range in molecular size, some proteins consisting of several million atoms....

Complex compounds of carbon, hydrogen, oxygen and nitrogen made up of amino acids joined by peptide linkages. Sulfur and phosphorous may also be constituents. Proteins are necessary dietary components for higher animals. Molecules are large and...

The agents of biological function, they are also the expression of genetic information. A biological molecule composed of amino acids. Proteins serves as the “building blocks” of body structures or as the enzymes that initiate specific...

Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by a gene...