Explain the use of lactase in the production of lactose-free milk?

The compound lactase includes a series of autosomal proteins that incorporate substrate material to the final product. Lactase, being the specific enzyme to obtain energy from the material of milk. Moreover, it works as a catalyst to speed up the reaction.

Dr. Amsberry, PHD

What an absolute load of bunkum - not sure where you got your PhD !!!!

What "Dr" Amsberry should have told you is that lactase is the enzyme which is responsible for the catalytic breakdown of lactose (a disaccharide molecule) into its consituent monosaccharide parts; these being glucose and galactose.

In the manufacture of lactose-free milk a recombinant lactase enzyme (i.e. one that has been produced commercially in bacteria) is added to a bulk culture of milk which is gently heated to activate the enzymatic catalysis - eventually breaking down all of the lactose present in the milk into the glucose and galactose monosaccharides to which a lactose-intolerant person will have no adverse reaction.