Crossword Puzzle Enzyme CrosswordOnline version Enzyme crossword by Marc Natta 1 a breakdown reaction 2 factor affecting enzymes 3 the substance the enzyme works on 4 a build up reaction 5 enzyme that breaks down hydrogen peroxide 6 when enzyme has changed shape and no longer works 7 ANY substance that speeds up a reaction 8 enzymes are ___ because they only work on one substrate 9 substance produced by the enzyme 10 conditions where enzymes are most active 11 enzymes ____ up reactions 12 a biological catalyst 13 liquid produced by catalase after breaking down hydrogen peroxide 9 10 6 12 5 4 13 8 11 1