<prompt> Glutamine synthetase is a -IsomeraseLigaseLyaseTransferase  <response>: Ans. is 4b i.e., Ligase Ref Essential of biochemsitry p. 186o All synthases are ligases.o All digestive enzymes are hydrolases.o Lyases are:DecarboxylasesAldolasesHydratasesEnolaseFumaraseArginosucinaseEnzyme classImportant enzymesOxidoreductaseOxidases, Dehydrogenases, Hydroperoxidases, catalase, peroxidase, oxygenases.TransferaseAmino transferase or transaminase, e.g., SGOT AST and SGPT ALT, kinases HexokinaseQ glucokinase, pyruvate kinase etc, Transketolases, transaldolases, transcarboxylases.HydrolasesAll digestive enzymes Pepsin, trypsin, lipases, esterases, lysosomal enzymes, urease, and phosphataseLyasesDecarboxylasesQ, aldolases, hydratases, enolase, fumaraseQ, ArginosuccinaseIsomerasesRacemases, epimerases. cis- trans- isomerases, mutasesLigasesSynthatasesQ, Carboxylases, DMA ligase 