Biocatalysis has proven itself to be a cost-effective basis for the production of polymer-grade monomers, but it has done so in spite of a most serious handicap: the high cost of industrial enzymes.Virtually all industrial enzymes are currently produced via fermentation, and the cost of manufacturing enzymes this way is seldom less than $10/lb.Many candidate processes cannot bear that cost for catalyst.Mol. Farming, which includes the production of industrial enzymes in field crops, offers a route for biocatalyst production that promises to drive the cost down by as much as 10X.I shall discuss two types of mol. farming, transient gene expression and transgenic crops, and the ways they might contribute to industrial biocatalysis.