Which element helps to maintain an anion-cation balance in cells and is involved in protein synthesis?

Options

A. Cu
B. Mg
C. CI
D. K

Answer

To answer the question about which element helps to maintain an anion-cation balance in cells and is involved in protein synthesis, we can follow these steps:

### Step 1: Identify the Elements
We need to consider various elements that are known to play a role in plant nutrition and cellular functions. The elements mentioned in the video transcript include copper, iron, magnesium, chlorine, and potassium.

### Step 2: Analyze Each Element's Role
- **Copper (Cu)**: Absorbed as cupric ion (Cu²⁺), important for certain enzymatic functions but does not play a significant role in maintaining anion-cation balance or protein synthesis.

- **Iron (Fe)**: Essential for overall metabolism and redox reactions but not directly involved in maintaining anion-cation balance or protein synthesis.

- **Magnesium (Mg)**: Absorbed as Mg²⁺, crucial for activating enzymes related to respiration and photosynthesis, and involved in DNA and RNA synthesis. However, it does not specifically maintain anion-cation balance.

- **Chlorine (Cl)**: Absorbed as chloride ion (Cl⁻), helps in determining solute concentration and maintaining anion-cation balance, but does not contribute to protein synthesis.

- **Potassium (K)**: Absorbed as K⁺, it plays a vital role in maintaining the balance of anions and cations in cells and is also directly involved in protein synthesis. Additionally, it regulates the opening and closing of stomata and activates various enzymes.

### Step 3: Conclusion
Based on the analysis, the element that helps maintain an anion-cation balance in cells and is involved in protein synthesis is **Potassium (K)**.

### Final Answer
The element that helps to maintain an anion-cation balance in cells and is involved in protein synthesis is **Potassium (K)**.

---