Amino acids are linked together to form which of the following?

Amino acids are the building blocks of proteins and are linked together through peptide bonds to form polypeptides. This process occurs during protein synthesis, where a chain of amino acids folds into a specific three-dimensional structure to perform various biological functions. Polypeptides can be composed of a single chain of amino acids or multiple chains that together form a functional protein.

The other options highlight different types of biomolecules. Fatty acids are long-chain hydrocarbons that serve as building blocks for lipids, primarily fats and oils. Sugars refer to carbohydrates, which are made up of monosaccharides and serve as a primary energy source in the body. Nucleotides are the basic units of nucleic acids, such as DNA and RNA, and consist of a sugar, a phosphate group, and a nitrogenous base. Each of these biomolecules plays distinct and crucial roles in biological systems, but they do not involve the direct linking of amino acids, which specifically results in the formation of polypeptides.