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Proteins contain carbon (C), hydrogen (H), oxygen (O), nitrogen (N) and may have other elements such as iron (Fe), phosphorous (P) and sulfur (S).
Proteins are made of amino acids. There are 20 common amino acids from which all proteins in living organisms are made. Nine of them are considered essential amino acids, as they cannot by synthesised in the body from other compounds, and must be obtained from the diet. Amino acids are bonded together by peptide bonds to form peptides. A long peptide chain forms a protein, which folds into a very specific three-dimensional shape. This three-dimensional shape is completely determined by the identity and order of the amino acids in the peptide chain. We often refer to four different levels of protein structure
Titany answered the question on September 13, 2021 at 05:48
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