The main arena of various types of activities of a cell is
" " Or
Proteins required for functioning of nucleus are formed in

Options

A. plasma membrane
B. mitochondrion
C. cytoplasm
D. nucleus

Explanation

To solve the question, we need to identify the main arena of various types of activities of a cell and where proteins required for the functioning of the nucleus are formed.

### Step-by-Step Solution:

1. **Identify the Main Arena of Cellular Activities**:
- The main arena of various types of activities in a cell is known as the **cytoplasm**. This is the region within the cell that excludes the nucleus and vacuoles and contains various organelles and structures necessary for cellular functions.

2. **Understanding the Role of Cytoplasm**:
- The cytoplasm is a gel-like substance that houses organelles such as ribosomes, mitochondria, and the endoplasmic reticulum. It is where many metabolic processes occur, making it the central hub for cellular activities.

3. **Protein Synthesis Location**:
- Proteins required for the functioning of the nucleus are synthesized in the **cytoplasm**. This occurs because ribosomes, which are the sites of protein synthesis, are located in the cytoplasm.

4. **Process of Protein Synthesis**:
- The process begins with the transcription of DNA into mRNA within the nucleus. The mRNA then exits the nucleus and enters the cytoplasm, where it binds to ribosomes. The ribosomes translate the mRNA sequence into a specific protein.

5. **Conclusion**:
- Therefore, both the main arena of cellular activities and the site of protein synthesis for the nucleus is the **cytoplasm**.

### Final Answer:
The main arena of various types of activities of a cell is **cytoplasm**. Proteins required for the functioning of the nucleus are formed in the **cytoplasm**.

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