Which of the following is indispensable for ATP synthesis?

Calcium

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Sulphur

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Phosphorus

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Iron

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Solution

The correct option is D Iron
Iron is a component of cytochromes. Cytochromes are iron porphyrin (heme) proteins present in mitochondrial electron transport system. All the cytochromes have iron only except for cytochrome a $_{3}$ . Cytochrome a $_{3}$ possesses iron and copper. With iron it picks up electrons and through copper it hands over electrons to oxygen.

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