This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolism, Subject name: Biochemistry
[{'content': 'Glutamine synthetase is a - \nSelect and explain. \nA. Isomerase, B. Ligase, C. Lyase, D. Transferase', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 4b' i.e., Ligase /Ref Essential of biochemsitry p. 186]o 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", 'role': 'assistant'}]