Final answer:
A molecule consisting of a specific sequence of amino acids linked together is called a polypeptide, which is the building block of proteins.
Step-by-step explanation:
The type of molecule that is made of a specific sequence of amino acids linked together is known as a polypeptide. Polypeptides are formed when amino acids are connected via a covalent bond called a peptide bond, which is the result of a dehydration reaction. This process involves the carboxyl group of one amino acid combining with the amino group of another, releasing a molecule of water. Proteins are actually composed of one or more polypeptides that have folded into a specific three-dimensional structure and have distinct functions.