mRNA is found attached to

Options

A. ribosomes
B. nuclear membrane
C. cell membrane
D. mitochondria

Answer

### Step-by-Step Solution:

1. **Understanding mRNA**: mRNA, or messenger RNA, is a type of RNA that carries genetic information from DNA to the ribosomes, where proteins are synthesized.

2. **Identifying the Attachment Site**: The question asks where mRNA is found attached. The primary site for mRNA attachment is the ribosome. Ribosomes are the cellular machinery that translate the mRNA sequence into a polypeptide chain (protein).

3. **Evaluating Other Options**:
- **Nuclear Membrane**: While mRNA is synthesized in the nucleus and may be found near the nuclear membrane during processing, it does not remain attached to it after processing. Therefore, this option is incorrect.
- **Cell Membrane**: The cell membrane is the outer boundary of the cell and does not play a role in mRNA attachment. Thus, this option is also incorrect.
- **Mitochondria**: Although mitochondria contain their own ribosomes and can synthesize some proteins, mRNA is primarily found attached to ribosomes in the cytoplasm, not directly to the mitochondria. Therefore, this option is incorrect as well.

4. **Conclusion**: The correct answer is that mRNA is found attached to ribosomes, which are the sites of protein synthesis.

### Final Answer:
mRNA is found attached to **ribosomes**.

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