Three codons on mRNA are not recognised by tRNA. What are they? What is the general term used for them? What is their significance in protein synthesis?

Explanation

### Step-by-Step Solution:

1. **Identify the Codons**: The three codons on mRNA that are not recognized by tRNA are:
- UAA
- UAG
- UGA

2. **General Term for These Codons**: The general term used for these codons is "nonsense codons" or "stop codons." They are also referred to as termination codons.
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