Torri had $20 to buy a birthday present for her dad. she decided to buy a dvd for 18$. the sales tax is 7%. does she have enough money?

answer; polycythemia is the correct answer;

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