Matching (1) optimum (a) taking a vaccine as a precaution against contracting a disease (2) inoculation (b) enzyme found in most plant and animal cells that functions as an oxidative catalyst; decomposes hydrogen peroxide into hydrogen and water ((3) stimulatory materials (c) the killing of undesirable organisms that might have and adverse effect on the product being manufactured . (4) catalase (d) a virus that is parasitic in bacteria; it uses the bacterium’s machinery and energy to produce more phage until the bacterium is destroyed and phage is released to invade surrounding bacteria (5) heat processing (e) substances that stimulate the growth and action of starter culture bacteria in milk (6) bacteriophage (f) most favorable condition or greatest degree or amount possible under given circumstance