At which end of mRNA translation always begins?

Options

A. 3'end
B. 5'end
C. any where on mRNA
D. UUU end

Answer

To answer the question "At which end of mRNA translation always begins?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Translation**:
- Translation is the process by which proteins are synthesized from messenger RNA (mRNA). It occurs in the cytoplasm of the cell.

2. **Identify the Ends of mRNA**:
- mRNA has two ends: the 5' end and the 3' end. The 5' end is the start of the mRNA molecule, while the 3' end is the opposite end.

3. **Determine Where Translation Initiates**:
- Translation always begins at the 5' end of the mRNA. This is where the ribosome binds to the mRNA to start the process of protein synthesis.

4. **Consider the Options Given**:
- The options provided were:
- A) 3' end
- B) 5' end
- C) Anywhere on the mRNA
- D) UUU end
- Based on our understanding, the correct answer is option B, which is the 5' end.

5. **Conclusion**:
- Therefore, translation always begins at the 5' end of the mRNA.

### Final Answer:
Translation always begins at the **5' end** of the mRNA.

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