This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
Copper is a constituent of the enzyme 
Select and explain. 
A. Lysyl oxidase, B. Glucose oxidase, C. Xanthine oxidase, D. Transketolase
A: Lysyl oxidase
Answer: A: Lysyl oxidase 
Explanation: Role in Enzyme Action: Cu forms integral pa of ceain enzymes, e.g. some of cytochromes, cytochrome oxidase, tyrosinase, Monoamine oxidase (MAO), Lysyl oxidase, Catalase, Ascorbic acid oxidase, uricase and superoxide dismutase. These enzymes contain about 550 mg of Cu per gram of enzyme proteinRef: MN Chatterjea Textbook of Medical Biochemistry, 6th edition, page no: 622