The association of two subunits of the ribosome in translation is governed by the concentration of

Options

A. `Mg^(2+)`
B. `Ca^(2+)`
C. `ATP`
D. `H^+`

Answer

To solve the question regarding the association of two subunits of the ribosome in translation and the governing concentration, we can follow these steps:

### Step 1: Understand the Structure of Ribosomes
Ribosomes are complex molecular machines made up of ribonucleic acid (RNA) and proteins. They play a crucial role in protein synthesis (translation) by facilitating the assembly of amino acids into polypeptide chains.

**Hint:** Ribosomes consist of two subunits that come together during protein synthesis.

### Step 2: Identify the Role of Ions in Ribosome Function
Various ions can influence the structure and function of ribosomes. Among these, Magnesium ions (Mg²⁺) are known to play a significant role in stabilizing the ribosomal structure.

**Hint:** Consider which ions are known to stabilize structures in biological systems.

### Step 3: Evaluate the Options
The question presents four options: Magnesium Ion, Calcium Ion, ATP, and Hydrogen. We need to determine which of these is primarily responsible for maintaining the structure of ribosomes during translation.

- **Magnesium Ion:** Known to stabilize ribosomal RNA and protein interactions.
- **Calcium Ion:** Plays various roles in cellular signaling but is not primarily associated with ribosome structure.
- **ATP:** Provides energy for various cellular processes but does not stabilize ribosomal structure.
- **Hydrogen:** While important in many biochemical processes, it does not specifically stabilize ribosomes.

**Hint:** Focus on the ion that is commonly associated with stabilizing RNA structures.

### Step 4: Conclude the Answer
Based on the evaluation, the Magnesium Ion is the correct answer as it is essential for maintaining the structural integrity of ribosomes during translation.

**Final Answer:** The association of two subunits of the ribosome in translation is governed by the concentration of **Magnesium Ion**.