Glutamine synthetase is a: (A) Isomerase, (B) Ligase, (C) Lyase, (D) Transferase
Answer is B. Ligases are enzymes that link two substrate together,usually with the simultaneous hydrolysis of ATP. Glutamine synthetase catalyses the amidation of glutamic acid to glutamine.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 49 and 224