Milady Cosmetology Practice Exam

What is a long chain of amino acids linked by peptide bonds referred to as?

1. Protein

2. Polypeptide Bonds

3. Enzyme

4. Polysaccharide

The correct answer is: Polypeptide Bonds

The correct term for a long chain of amino acids linked by peptide bonds is a protein. Proteins are essential macromolecules made up of one or more long chains of amino acids, which are linked together by peptide bonds. The structure and function of proteins are determined by the specific sequence of amino acids in the chain. While the term "polypeptide" is often used to describe a chain of amino acids, it typically refers to shorter chains, and proteins are generally composed of one or more polypeptides that have folded into a functional form. Therefore, when discussing a long chain of amino acids, the more accurate descriptor is "protein," as it encompasses the full structure and biological function. The other options do not accurately describe a chain of amino acids linked by peptide bonds. Enzymes are a specific type of protein that catalyzes biochemical reactions but do not refer to the structure itself. Polysaccharides refer to long chains of sugar molecules, which are a different type of biomolecule altogether.