Which of the following statements about feedback regulation of a metabolic pathway is incorrect? 1) the final product of a metabolic pathway is the compound that regulates the pathway 2) the products of the pathway become the reactants for a different reaction, and thus products are unable to accumulate. 3) the enzyme that is regulated by feedback inhibition is usually the first enzyme in the metabolic pathway 4) the compound that regulates the pathway acts as a non-competitive inhibitor or a negative allosteric regulator. 5) accumulation of the product of the pathway will tend to slow down further formation of that product