The element responsible for the ring structure of chlorophyll and maintenance of ribosome struct...

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The element responsible for the ring structure of chlorophyll and maintenance of ribosome structure is
(A) \( \mathrm{Ca}^{++} \)
(B) \( \mathrm{Mg}^{++} \)
(C) \( S \)
(D) \( \mathrm{K}^{+} \).
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