The changing composition of a gene pool with regard to a particular allele over a measurable period of time is called . Select one: A. molecular evolution B. microevolution C. macroevolution D. None of the answers are correct

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