Following are given sequences of mRNA Identify the one that will not undergo complete translation.

Options

A. 5 ' AUG UUC AGC UCG UGA 3'
B. 5' AUG CCA UAC GAC UAG 3'
C. 5 ' AUG UUA CUC GCG UAA 3'
D. 5' AUG AAC UAA CCA CUC 3'

Answer

To solve the question of which mRNA sequence will not undergo complete translation, we need to identify the presence of stop codons in the given sequences. Here’s a step-by-step breakdown of how to approach this:

### Step-by-Step Solution:

1. **Understand the Concept of Translation**:
- Translation is the process where ribosomes synthesize proteins using mRNA as a template.
- It begins at the start codon (AUG) and ends at a stop codon.

2. **Identify Stop Codons**:
- The three stop codons in mRNA are:
- UAA
- UAG
- UGA
- These codons signal the termination of protein synthesis.

3. **Analyze the Given mRNA Sequences**:
- You will be provided with several mRNA sequences. You need to check each sequence for the presence of any of the stop codons listed above.

4. **Examine Each Option**:
- For each mRNA sequence, look for the presence of UAA, UAG, or UGA.
- If a sequence contains any of these stop codons, it will undergo complete translation until that point.
- If a sequence does not contain any of these stop codons, it will not undergo complete translation.

5. **Determine the Correct Answer**:
- After analyzing all the sequences, identify the one that lacks all three stop codons. This is the sequence that will not undergo complete translation.

### Conclusion:
- Based on the analysis, the mRNA sequence that does not contain any stop codon is the one that will not undergo complete translation.

### Final Answer:
- The answer is **option D**, as it does not contain any of the stop codons (UAA, UAG, UGA).