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
Cytochrome oxidase contains 
Select and explain. 
A. Ca++, B. Cu, C. Mn, D. Zn
B: Cu
Answer: B: Cu 
Explanation: (CU) (76 - Lippincott's) (104 - HP 27th)Cytochrome oxidase (cytochroe a + a3) contains bound copper atoms, that are required for this complex reaction to occur