The "-NH2" group, known as an amine group, consists of one nitrogen atom bonded to two hydrogen atoms. It is a functional group commonly found in organic chemistry, particularly in amino acids and amines. The presence of the amine group can influence the properties of molecules, such as their solubility and reactivity. In biological systems, the amine group plays a crucial role in the structure of proteins and nucleotides. It can participate in various chemical reactions, including the formation of peptide bonds that link amino acids together. Understanding the amine group is essential for studying biochemical processes and synthesizing new compounds.