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The two sub-units of ribosome remain united at a critical ion level of

1. copper
2. manganese
3. magnesium
4. calcium

Correct answer: magnesium

Solution

Magnesium ions help stabilize rRNA folding and the interactions between the large and small ribosomal subunits. When Mg2+ levels drop, the subunits tend to dissociate; at adequate levels, they remain united.

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