Physics

Amino acids are organic molecules that are the building blocks of proteins, with a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a unique side chain called an R-group. They are essential for life, as the body uses them to build proteins and other molecules needed for countless functions like repairing tissue, making hormones, and helping with metabolic processes. The human body needs 20 different types of amino acids to build proteins, and while it can produce some, others called essential amino acids must be obtained from food. Structure Each amino acid has a core structure consisting of a central carbon atom, known as the alpha-carbon. This alpha-carbon is attached to four groups: An amino group (\(-NH_{2}\)) A carboxyl group (\(-COOH\)) A hydrogen atom (\(H\)) A unique side chain, or R-group The R-group is what makes each amino acid different and determines its unique chemical properties. Types of amino acids Essential amino acids: These are amino acids that the body cannot make on its own and must be consumed through the diet. There are nine essential amino acids, such as histidine and isoleucine. Nonessential amino acids: These are amino acids that the human body can produce itself. Conditional amino acids: These are essential only under specific circumstances, such as during illness or periods of stress. Function Building block of proteins: Amino acids link together in chains to form proteins. Protein diversity: The order of amino acids in a protein's chain gives it a unique sequence, which in turn determines its 3D shape and function. Other roles: Amino acids are also used to build other vital compounds, such as hormones and neurotransmitters.