Origin of proteinGerman from French protéine from Classical Greek pr?teios, prime, chief from pr?tos, first (see proto-): from being a chief constituent of plant and animal bodies
These are all good sources of protein.
The definition of a protein is a substance that has amino acids, compounds and carbon, hydrogen, oxygen, nitrogen and sometimes sulfur and is found in many foods.
An example of a protein is the type of nutrient found in meats.
any of a large class of complex polymers consisting of long chains of polypeptides often bonded with nucleic acids, lipids, etc.: proteins are found in all cells, are essential to the diet of animals, are the basic components of cartilage, hair, skin, etc., and often function as enzymes, hormones, or antibodies
Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of one or more chains of amino acids. Proteins are fundamental components of all living cells and include many substances, such as enzymes, hormones, and antibodies, that are necessary for the proper functioning of an organism. They are essential in the diet of animals for the growth and repair of tissue and can be obtained from foods such as meat, fish, eggs, milk, and legumes.
Origin of proteinFrench protéine from Late Greek prōteios of the first quality from Greek prōtos first ; see per1 in Indo-European roots.
- pro′tein·a′ceous pro·tein′ic pro·tein′ous
Any of a large class of complex organic chemical compounds that are essential for life. Proteins play a central role in biological processes and form the basis of living tissues. They consist of long chains of amino acids connected by peptide bonds and have distinct and varied three-dimensional structures, usually containing alpha helices and beta sheets as well as looping and folded chains. Enzymes, antibodies, and hemoglobin are examples of proteins.
A Closer Look Proteins are the true workhorses of the body, carrying out most of the chemical processes and making up the majority of cellular structures. Proteins are made up of long chains of amino acids, but they don't resemble linear pieces of spaghetti. The atoms in these long chains have their own attractive and repulsive properties. Some of the amino acids can form bonds with other molecules in the chain, kinking and twisting and folding into complicated, three-dimensional shapes, such as helixes or densely furrowed globular structures. These folded shapes are immensely important because they define the protein's function in the cell. Some protein shapes fit perfectly in cell receptors, turning chemical processes on and off, like a key in a lock, whereas others work to transport molecules throughout the body (hemoglobin's shape is ideal for carrying oxygen). When proteins fail to take on their preordained shapes, there can be serious consequences: misfolded proteins have been implicated in diseases such as Alzheimer's, mad cow, and Parkinson's, among others. Exactly how proteins are able to fold into their required shapes is poorly understood and remains a fundamental question in biochemistry. See more at prion
(countable and uncountable, plural proteins)
- (biochemistry) Any of numerous large, complex naturally-produced molecules composed of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds.
- (nutrition) One of three major classes of food or source of food energy (4 kcal/gram) abundant in animal-derived foods (ie: meat) and some vegetables, such as legumes. see carbohydrate and fat for the other two major classes
- For each dish, select a curry, protein, and spiciness.
protein - Medical Definition
- Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of one or more chains of amino acids. Proteins are fundamental components of all living cells and include many substances, such as enzymes, hormones, and antibodies, that are necessary for the proper functioning of an organism. They are essential in the diet of animals for the growth and repair of tissue and can be obtained from foods such as meat, fish, eggs, milk, and legumes.
- A food that is composed of such macromolecules: What protein would you like for dinner: chicken or fish?
- The portion of a food consisting of such macromolecules: Nuts contain significant quantities of protein.
- pro′tein·aceous (prōt′n-āshəs, prō′tē-nā-) pro·teinic (prō-tēnĭk) pro·teinous (prō-tēnəs)
- This is especially unfortunate because a major crop in Africa, grain sorghum, has a somewhat indigestible protein which our bodies have a hard time metabolizing.
- This is exactly the kind of problem geneticists can sink their teeth into, so to speak, to make the protein in this grain digestible.
- When he said he was becoming a vegetarian, his parents were worried he wouldn't get enough protein in his diet.
- Scientists are conducting more research on the structure of the protein.
- She always starts out her day with a protein shake because it will satisfy her hunger until lunch.