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Three codons causing chain termination are

1. TAG, TAA, TGA
2. GAT, AAT, AGT
3. TAG, TGA, UGA
4. UAG, UGA, UAA

Correct answer: UAG, UGA, UAA

Solution

The three termination codons in mRNA are UAG, UGA, and UAA. They signal the ribosome to stop translation, so the option containing exactly these three is correct.

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