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The two subunits of ribosome remain united at a critical ion level of magnesium. The presence of magnesium and its amount plays an important role in the appearance and structure of the ribosomes.

1. If magnesium is absent in the medium, the large particles fall apart to display a group of smaller particles.
2. The two subunits of ribosome remain united at a critical ion level of magnesium.
3. The presence of magnesium and its amount plays an important role in the appearance and structure of the ribosomes.
4. None of the above.

Correct answer: The two subunits of ribosome remain united at a critical ion level of magnesium.

Solution

Magnesium ions stabilize ribosome structure by helping the large and small subunits remain associated. At a critical Mg2+ concentration, the ribosome stays intact; without enough magnesium, it can dissociate into subunits.

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