1. CHEESE
Animal rennet: from the stomachs of mammals to digest milk and is also used to produce cheese. (You have to kill the animal to get the enzymes)
Vegetarian rennet: no worldwide industrial production to vegetable rennet. The on that is used is actually a mold Mucor miehei.

2. Leather Tanning Tanning-animal skin chemically treated
Deliming-Enzymes are used to make the product smoother softer and flexible
Bating-Remove unwanted components by enzymatic action
Protease,lipases,amylases
Not to damage collagen

5. BREWING
1.extraction and breakdown of carbohydrates to make sugar solution 2. is used as a nutrient source for anaerobic yeast grow to break down simple sugars 3. That releases energy and produces ethanol and carbon dioxyde as by-products. 4. The processes are catalysed by naturally produced enzymes from barley and yeast