Compare the Amino Acid Decarboxylation Mechanism animation with the Tryptophan Synthase Mechanism animation to answer the question. Both amino acid decarboxylase and tryptophan synthase are enzymes involving pyridoxal phosphate (PLP) in their mechanisms. There are both similarities and differences between the two mechanisms. For each of the statements describing a mechanism feature, indicate whether it is a feature of the decarboxylase, the synthase, or both.

PLP facilitates sigma bond breakage only at the alpha-carbon of the amino acid.

PLP facilitates sigma bond breakage at the beta-carbon of the amino acid.

The amino acid displaces an enzyme lysine residue in forming a PLP aldimine derivative.

PLP forms a quinonoid structure when electrons are delocalized from the amino acid.

Active sites on two different subunits are involved in the reaction.

Both the substrate and produce are amino acids.