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| Column-$I$ | Column-$II$ |
| $P$. Structural elements | $I$. $C, H, O, N$ |
| $Q$. Energy-related chemical components | $II$. $Zn^{+2}, Mo, Mg^{+2}$ |
| $R$. Elements involved in enzyme activation or inhibition | $III$. Potassium |
| $S$. Elements involved in osmotic potential | $IV$. Phosphorus, Magnesium |
| List-$I$ | List-$II$ |
|---|---|
| $(1)$ For repair of worn-out cells | $(a)$ Phosphorus |
| $(2)$ In the structure of $ATP$ | $(b)$ Magnesium |
| $(3)$ In the synthesis of $ATP$ | $(c)$ Zinc |
| $(4)$ In the structure of myoglobin in muscles | $(d)$ Iron |
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