Nucleus controls cytoplasmic functioning by sending out

Options

A. Cholesterol
B. Protein
C. RNAs
D. DNA copies

Answer

To answer the question "Nucleus controls cytoplasmic functioning by sending out," we will analyze the options provided and understand the role of the nucleus in cellular processes.

### Step-by-Step Solution:

1. **Understanding the Role of the Nucleus**: The nucleus is the control center of the cell, housing the cell's genetic material (DNA). It is responsible for regulating various cellular activities, including growth, metabolism, and reproduction.

2. **Transcription Process**: Within the nucleus, the process of transcription occurs. This is where the DNA is used as a template to synthesize messenger RNA (mRNA). The mRNA carries the genetic information needed for protein synthesis.

3. **Transporting mRNA**: Once mRNA is synthesized, it exits the nucleus through the nuclear pores and enters the cytoplasm. This transport is crucial because the mRNA must reach the ribosomes, where proteins are synthesized.

4. **Translation Process**: In the cytoplasm, the mRNA attaches to ribosomes, which read the mRNA sequence and translate it into a specific protein. This process is essential for the functioning of the cell, as proteins are involved in virtually all cellular activities.

5. **Evaluating the Options**:
- A. Cholesterol: This is a type of lipid and is not sent out by the nucleus.
- B. Protein: While proteins are crucial for cell function, they are synthesized in the cytoplasm, not sent out by the nucleus.
- C. RNAs: This includes mRNA, which is indeed sent out from the nucleus to the cytoplasm for protein synthesis.
- D. DNA copies: The nucleus does not send out DNA copies; rather, it retains the DNA for replication and transcription purposes.

6. **Conclusion**: The nucleus controls cytoplasmic functioning primarily by sending out RNAs, specifically mRNA, which is essential for the synthesis of proteins in the cytoplasm.

### Final Answer:
The correct answer is **C. RNAs**.

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