How can the size of a synthesized protein be measured?

The size of a synthesized protein is most accurately assessed by the number of amino acids it contains and its total molecular mass. Proteins are polymers made up of amino acids linked by peptide bonds, and the specific sequence and quantity of these amino acids determine both the protein's size and its molecular weight.

Measuring the number of amino acids provides a direct count of the building blocks that make up the protein, while calculating the total molecular mass involves summing the mass of each constituent amino acid, which is essential for understanding the protein's overall size and behavior in a biological context.

Other methods of measurement, like analyzing shape and color, may offer some insights into the protein's structure but do not accurately reflect its size. Chemical reactivity can inform about functional aspects of the protein but does not provide a measure of its physical dimensions. The rate of enzyme production relates to enzyme activity rather than directly to the protein's size. Therefore, option A is the most comprehensive and scientifically valid method for measuring the size of a synthesized protein.