Final answer:
Biocatalysis is preferred over chemical synthesis in producing stereospecific results, as enzymes like fumarase and chymotrypsin create products that are not mixtures but single stereoisomers.
Step-by-step explanation:
Biocatalysis generally has the advantage over chemical synthesis because natural enzymes exhibit stereospecificity, meaning that the product is not a mixture of different stereoisomers.
This specificity results in reactions that preferentially produce a single stereoisomeric form of the product. For example, the enzyme fumarase reacts selectively with fumarate, producing (S)-malate and not its stereoisomer (R)-malate.
Biological systems, including enzymatic reactions, are characterized by this high level of selectivity, as seen with the enzyme chymotrypsin and its precise chiral selectivity among possible stereoisomers for amino acid L-configuration.