This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Kinase require 
Select and explain. 
A. Mn++, B. Cu++, C. Mg++, D. Inorganic phosphate
C: Mg++
Answer: C: Mg++ 
Explanation: Mg++ is the activator of many enzymes requiring ATP. Alkaline phosphatase, hexokinase, fructokinase, phosphofructokinase, adenyl cyclase, cAMP-dependent kinases, etc. need magnesium.Ref: DM Vasudevan, Page no: 420