Injecting a person with a killed-bacteria vaccine can protect that individual from a disease because the proteins of the bacteria:

a) remain in the body and live bacteria later prey on them instead of live tissue

b) blind with receptors in the body, so that live bacteria cannot bind with them later

c) stimulate the production of antibodies which can be manufactured later to respond to infection

the answer is c) stimulates the production of antibodies which can be manufacrured later to respond to infection

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products