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Which ionholds the ribosomal subunits to...

Which ionholds the ribosomal subunits together

A

`Ca^(+2)`

B

`Mn^(+2)`

C

`Mg^(+2)`

D

`Na^(+)`

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Ribosomal Subunits**: Ribosomes are composed of two subunits: a small subunit and a large subunit. Each of these subunits contains ribonucleic acid (RNA) and proteins. 2. **Function of Ribosomes**: The primary role of ribosomes is to facilitate protein synthesis. For this process to occur, the small and large subunits must come together. 3. **Importance of Ions**: The binding of the ribosomal subunits is influenced by certain ions present in the cell. These ions help stabilize the interaction between the two subunits. 4. **Identifying the Ion**: Among the options provided (calcium, manganese, magnesium, and sodium), magnesium ions (Mg²⁺) are known to play a crucial role in the binding of ribosomal subunits. 5. **Role of Magnesium Ions**: Magnesium ions help in stabilizing the structure of the ribosome by facilitating the binding of the small and large subunits. If magnesium ion concentration is adequate, the subunits will remain bound together, allowing protein synthesis to proceed. Conversely, if magnesium levels are low, the subunits may dissociate. 6. **Conclusion**: Therefore, the ion that holds the ribosomal subunits together is magnesium (Mg²⁺).
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