Protein fat carbs calories per gram

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Articles from Britannica Encyclopedias for elementary and high school students. A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Where does protein synthesis take place? Proteins are not stored for later use in animals.

Proteins are essential for life and are essential for a wide range of cellular activities. Proteins are of great nutritional value and are directly involved in the chemical processes essential for life. There are about 20 different amino acids that occur naturally in proteins. The protein content of animal organs is usually much higher than that of the blood plasma.

Muscles, for example, contain about 30 percent protein, the liver 20 to 30 percent, and red blood cells 30 percent. What are proteins and what do they do? Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body’s tissues and organs. Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains.

There are 20 different types of amino acids that can be combined to make a protein. The sequence of amino acids determines each protein’s unique 3-dimensional structure and its specific function. Antibodies bind to specific foreign particles, such as viruses and bacteria, to help protect the body. Enzymes carry out almost all of the thousands of chemical reactions that take place in cells.