Difficulty: Easy
Correct Answer: Magnesium (Mg)
Explanation:
What is being asked?The central metal in the chlorophyll macrocycle.
Given data
Concept/ApproachIn chlorophyll a/b, the macrocycle chelates magnesium (Mg2+). (By contrast, heme contains Fe, and plastocyanin contains Cu.)
Final AnswerMagnesium (Mg)
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