Multiple proteins can come together, often by binding together to form stable protein complexes that fold or helix to form a certain spatial structure and thus perform a specific function. The organelle that synthesizes polypeptides is the ribosome on the stratified endoplasmic reticulum in the cytoplasm.
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Ingested proteins are digested in the body, hydrolyzed into amino acids and absorbed, and then re-synthesized into proteins needed by the body
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New proteins are constantly being metabolized and broken down, in a dynamic balance
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The quality and quantity of food protein and the ratio of various amino acids are related to the amount of protein synthesis in the human body
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The growth and development of adolescents, maternal fertility, and the health and longevity of the elderly are all closely related to the amount of protein in the diet
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Protein is also divided into complete and incomplete proteins. Proteins that are rich in essential amino acids and of good quality are collectively called complete proteins
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Proteins that lack essential amino acids or contain very little are called incomplete proteins, such as those contained in cereals, wheat, corn and gelatin in animal skin and bones
