Final answer:
A product of gene expression containing amino acids linked by peptide bonds is correctly identified as a protein. Proteins are made up of amino acids connected by peptide bonds, which fold into a unique 3D structure to perform various cellular functions.
Step-by-step explanation:
A student asked about the product of gene expression that contains amino acids linked by peptide bonds. The correct answer is that such a product is a protein. Proteins are macromolecules that have diverse functions in cells, including structural support and enzymatic activity. The monomers of proteins are amino acids, which are connected via peptide bonds to form long chains known as polypeptides. A peptide bond is formed through a dehydration reaction between the carboxyl group of one amino acid and the amino group of another.
Once synthesized, a polypeptide undergoes folding and sometimes further modification to become fully functional. These processes result in the final protein having a unique 3D shape and function, which can be compromised if the protein is denatured by changes in conditions such as pH or temperature.
In summary, a product of gene expression containing amino acids linked by peptide bonds is called a protein. This is the most accurate answer compared to the other options like carbohydrate, lipid, and nucleic acid which have different structures and functions.