Which of the following is a major component of thiamine,biotin,coenzyme $A$,and ferredoxin?

  • A
    Magnesium
  • B
    Sulfur
  • C
    Manganese
  • D
    Iron

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Which element is required for the activity of carbonic anhydrase?

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The essential mineral for the formation of body protein is

Select the correct option:
$(1)$ Magnesium / Manganese is a component of the ring structure of chlorophyll.
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Iron is present in which of the following?

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