What is the main function of a glycosidic bond?

The main function of a glycosidic bond is to link carbohydrates together. Glycosidic bonds are formed between the hydroxyl group of one monosaccharide and the anomeric carbon of another, resulting in the creation of disaccharides, oligosaccharides, and polysaccharides. This type of bond plays a crucial role in the structure and function of carbohydrates, facilitating the formation of more complex carbohydrate structures that serve various biological roles, including energy storage and structural components of cells.

In contrast, the other functions mentioned are not related to glycosidic bonds. Amino acids are linked together by peptide bonds, which are specific to proteins. The connection of lipids and proteins typically involves different types of bonds or interactions, such as ester bonds for lipid formation or covalent bonds in certain protein-lipid complexes. Hydrogen bonds are a type of non-covalent interaction that play roles in stabilizing structures like DNA but are not directly involved in linking carbohydrates. Thus, the linking of carbohydrates through glycosidic bonds is what distinctly qualifies the correct answer.