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
Glutathion synthetase requires - 
Select and explain. 
A. Copper, B. Selenium, C. Magnesium, D. Iron
C: Magnesium
Answer: C: Magnesium 
Explanation: Ans. is 'c' i.e., Magnesium o The two enzymes required for de novo synthesis of glutathione are :-1) Glutamyl cystein synthetase# It requires glutamic acid, cysteine, ATP and Mg+2: to form g-glutamyl cysteine:Glutathione synthetase# It requires glycine, ATP and Mg+2 to synthesize glutathione from g-glutamyl cysteine.Remembero Glutathione synthetase requireso Glutathione peroxidase contains- Magnesium- Selenium