The active molecules in all cells, proteins are responsible for almost all of the functions and structures of living things. A gene contains the instructions for making a specific type of protein. Examples are hormones, enzymes, and antibodies.

Naturally occurring substances made up of amino acids. The human body needs many types of proteins, including hormones, enzymes, and antibodies.

Molecules that make cells and carry out cellular functions, including enzymes, hormones, and antibodies. They are made up of strings of amino acids. Certain food such as meat, fish, eggs, and beans are good sources of protein, necessary for the growth and repair of human tissue.

Large molecules that consist of hundreds of thousands of amino acids linked to form long chains, which are often folded in various ways. Protein is the major source of building material for muscles, blood, skin, hair, nails and the internal organs. It is necessary for the formation of hormones, enzymes, and antibodies and as a source of heat and energy and it functions as an essential element in proper elimination of waste materials. Rich dietary sources are meat, poultry, fish, eggs, milk and cheese, which are classified as complete proteins because they contain the eight essential amino acids. Protein deficiency causes abnormal growth and tissue development in children, whereas in adults it results in lack of vigor and stamina, weakness, mental depression, poor resistance to infection, impaired healing of wounds and slow recovery from disease. Excessive intake of protein may in some conditions result in fluid imbalance.

A group of complex organic macromolecules that are the basic building blocks of all living cells and are therefore essential in the diet of animals for the growth and repair of tissue.

The building blocks of the body, which are assembled according to genes.

This is a family of complex foodstuffs consisting of any of a mind-boggling array of "building blocks" called amino acids. The human body can manufacture some amino acids (and, therefore, some proteins) but a number of the "minor" proteins must be obtained from the foods we eat. This necessitates a significant diversity in the "balanced" diet.

are essential to living organisms; they are long chains of amino acids linked together by peptide bonds. Enzymes, hormones, and antibodies are all types of protein.

a long chain of amino acids linked end to end by peptide bonds. J K Y Z

Basic building blocks of living cells essential for living beings.

Macromolecules seen in high proportions in the constitution of living matter. A group of substances formed by amino-acids.

derived from synthetic and natural sources such as collagen, milk, keratin, and silk, these are found in hair conditioners and hair spritzes. They add shine and body to the hair and help smooth split ends; examples include hydrolyzed animal protein, hydrolyzed keratin, hydrolized soy protein, hydrolyzed whole-wheat protein, and silk amino acids.

The basic building block of the body. As well as forming the structure of tissues such as muscle they also act as enzymes controlling the chemical processes of the body. They are made up of a combination of over 20 different amino acids

Molecules, composed of amino acids, that make up many of the structural components of the body and that are needed to maintain all normal body functions.

A group of complex organic molecules that consist of amino acids joined together by peptide bonds References Campbell, Neil A. and Jane B. Reece. Biology. “Cnidarians have Radial Symmetry, a Gastrovascular Cavity, and Cnidocytes.” 643-644. 2005. “Cnidaria.” Wikipedia. http://en.wikipedia.org/wiki/Cnidaria Sher, Daniel et al. “Toxic Polypeptides of the Hydra - a Bioinformatic Approach to Cnidarian Allomones." Toxicon 45. (2005: 865-879).

Large molecules formed from amino acids linked by peptide (amide) bonds. Some proteins are glycosylated (linked to carbohydrates) or modified with other substances.

Highly complex organic compounds found in all living cells. Protein is the most abundant class of all biological molecules, comprising about 50 percent of cellular dry weight. Structurally, proteins are large molecules composed of one or more chains of varying amounts of the same 22 amino acids that are linked by peptide bonds. Each protein is characterized by a unique and invariant amino acid sequence. The information for the synthesis of the specific amino acid sequence in a protein, from free amino acids, is carried by the cell's nucleic acid.

large molecules made of chains of amino acids; basic building blocks of 1Sfe-foruns

Proteins are substances that are essential parts of the body. For example, they form the structural material of muscles, tissues and organs. In addition, enzymes are proteins, as are many hormones. Proteins are required in the diet (from foods such as meat and dairy products) so that they can be broken down by digestion, absorbed and then rebuilt in forms that the body needs. Enough protein in the diet is essential to keep the body healthy.

Complex, organic compounds that contain carbon, hydrogen, oxygen, and nitrogen. It is the presence of nitrogen that differentiates proteins from carbohydrates and fats. The basic building blocks of proteins are amino acids. Humans need 22 amino acids for the synthesis of their proteins. The human body can make only 13, known as nonessential amino acids because we don't need to get them from the food we eat. There are nine essential amino acids that are not made by the body and can be obtained only from food.

Amino acid polymers with specific biological functions, especially the growth, regeneration and repair of cells.

Nitrogen-containing compounds, an excess of which cause a haze in beer.

large organic molecules that are made up of all of the basic substances of the body.

Proteins are the building blocks of muscle, enzymes, and sonic hor-mones. They are made up of amino acids and are essential for growth and repair in the body. A gram of protein contains four calories. Those from ani-mal sources contain the essential amino acids. Those from vegetable sources contain some but not all of the essential amino acids. Proteins are broken up by the body to produce amino acids.

represent a class of molecules that have varied functions. Eggs, muscles, antibodies, silk, fingernails, and many hormones are partially or entirely proteins.

long chains of amino acid units that are the main molecules from which living things are constructed.

Strings of amino acids which make enzymes and structural parts essential for cell metabolism and growth.

Complex molecules made by genes that give structure to our organs, bones and muscles. Often called the building blocks of tissues.

Polymers composed of a linear string of amino acids.

Large molecules, made of specific sequences of amino acids, that carry out many molecular activities of cells and organisms.

Large molecules composed of long chains of amino acids linked together. Proteins help maintain the cellÕs structure and participate in many biological functions, including the regulation of metabolic reactions. The shape and function of a protein is determined by the sequence of its amino acids.

Proteins are essential molecules in the body that are made up of strings of amino acids. The genes in our DNA contain the necessary information to make all the proteins in our bodies. Examples of proteins include antibodies and blood clotting factors.

supply energy at 4 calories per gram. A protein is broken down into amino acids, which are then used to build, repair and maintain body tissues and to allow new growth and development. Protein is also essential for manufacture of hormones, antibodies, and enzymes. Protein differs from other macronutrients because it contains nitrogen.

building blocks and workhorses of cells; proteins are able to serve both structural and functional roles within our bodies.

Biological molecules involved in many processes in living organisms: proteins are involved in controlling the metabolism of cells, controlling the structure and movement of cells and larger structures and coordinating the response of cells to internal and external factors. The structure and activity of proteins is specified by the genetic information in DNA and so can be seen as carrying out the instructions contained in DNA.

Molecules needed for the body to function properly. A number of proteins have roles in detecting and repairing DNA damage.

Compounds that are found throughout the body and serve many important functions. They are the main components of cells. Growth hormone and IGF-I are examples of proteins.

Large molecules in the body containing various substances that have a variety of functions, including making up the structure of many body tissues, enzymes that promote biochemical reactions in the body, and hormones.

An extremely complex molecule, which can consist of thousands of amino acid and millons of atoms to formed in a chain structure.

A class name of a major food group that includes animal proteins (meats) and vegetable proteins (beans, lentils). Proteins are composed of amino acids and are the building blocks of the body.

Complex molecules involved in the allergic response. It is the proteins in pet dander that cause allergic reactions.

Biological molecules that are essential for all life processes and are encoded by an organism's genome. A protein consists of chains of amino acid subunits and its function depends on its three-dimensional structure, which is determined by its amino acid sequence.

Complex nitrogenous organic compounds of high molecular weight made of amino acids; essential for growth and repair of animal tissue. Many, but not all, proteins are enzymes.

Large organic molecules that perform many of the metabolic activities taking place within a cell. Typically roles are as enzymes, transporters, communicators, sensors, activators and structural elements. The proteins are constructed from chains of amino acids linked together in a sequence defined by the DNA of the genes.

A biological molecule important in many cellular processes that consists of many building blocks, called amino acids, that are chained together by chemical bonds. The sequence of amino acids in a protein is determined by the sequence of nucleotides in a DNA molecule.

Go to Biochemical Molecules Complex combinations of amino acids that are present in plant and animal cells and are essential to life.

naturally occurring complex combinations of amino acids that are present in plant and animal cells and are essential to life. The human body contains over 100,000 proteins.

Polymers made up of amino acids that perform a wide variety of cellular functions. One of the classes of organic macromolecules that function as structural and control elements in living systems. Proteins are polymers of amino acids linked together by peptide bonds.

Compounds made up of amino acids found in all animal and vegetable tissues. Acquired as part of the human diet and essential for tissue growth and repair.

Compounds which contain the elements carbon, hydrogen, oxygen, nitrogen and sometimes, but not always, phosphorus and sulphur. Consist of sub units called amino acids; one of the major classes of nutrients having a wide range of biological functions.

the total nitrogenous material in plant or animal substance

One of four main classes of macromolecules (in addition to nucleic acids, carbohydrates, and lipids) in living systems. Proteins are composed of amino acids and perform a wide variety of activities throughout the body.

Food substances formed of amino acids; The function of proteins is to build and repair tissue for hormone production and enzyme function. Proteins consist of nitrogen, oxygen, carbon and hydrogen.

Proteins are on the very important nutrients of the body and made up of combination of many chemicals called amino acids.

Protein is vital for growth and repair. Cats also meet most of their energy needs through protein (meat, fish, eggs and cheese). A good diet will provide 25-30% of protein for an adult cat. Some of the 20 amino acids (the building-blocks of protein) cannot be synthesised by cats, and must be provided in the diet. Most cat food manufacturers supplement their food with taurine, as a taurine-deficient diet can lead to heart disease and blindness.

Molecules make up of amino acids arranged in a specific order determined by the genetic code. Proteins are essential for all life processes. Certain ones, such as the enzymes that protect against free radicals and the lymphokines produced in the immune system, are being studied extensively by gerontologists.

Nitrogenous substances essential for the production of new body tissues.

Highly complex nitrogen or sulfur-containing compounds found primarily in animal sources and in some plant sources and are the building blocks for all of the structural components of our bodies.

Proteins are nitrogen-containing compounds that are composed of chains of amino acids. Proteins are essential in our diet and are used as structural material, to produce hormones and enzymes, and can be used as fuel as well.

Naturally occurring organic compounds essential to the structure and function of the body.

Components essential in the diet of animals for the growth and repair of tissue. 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 can be obtained from foods such as meat, fish, eggs, milk, and legumes.

Biological compounds, essential for all life processes. The information needed to make proteins is encoded in genes.

Large, complex molecules made from amino acids. Protein is needed for the structure, function, and regulation of the body. The "contracting" components of muscle cells are proteins, as are hormones, enzymes, and antibodies.

a group of complex organic macromolecules that are made up of amino acids. Since amino acids provide the basic building blocks of all living cells, protein is essential in the diet

molecules made from chains of amino acids coded for in the genes. Hormones, components of the complement and clotting cascade, histamine and enzymes are all proteins.

a molecule constructed from amino acids according to genetic instructions

Combinations of amino acids (the basic building blocks of life that make up DNA) that carry out most of the work needed to live.

The active molecules in all cells. Proteins control biochemical reactions and determine the physical structure of organisms.

complex chemical substances made of amino acids; proteins are essential constituents of all living cells.

Large molecules made up of amino acid building blocks.

Organic compounds made up of amino acids. Proteins are one of the major constituents of plant and animal cells.

Complex molecules that are responsible for specific and unique functions within the body. Examples of proteins include hormones, enzymes, and antibodies.

Organic compounds made up of amino acids. Proteins are responsible for most of the function and much of the structure of living organisms, including humans

Highly complex organic compounds found naturally in all living cells. Proteins are a source of heat and energy to the body. They are essential for growth, the building of new tissue, and the repair of injured tissue.

Large molecules composed of one or more chains of amino acids in a specific order determined by the base sequence of nucleotides in the DNA coding for the protein. See the entire definition of Proteins

Substances that are essential to the body's structure and proper functioning.

organic compounds made up of amino acid molecules. One of the three main food groups, proteins are needed by the body for cell growth and repair. Humans as organisms

the foundation of every body cell; biological molecules composed of chains of amino acids