Biology · Genetics
Consider the following statements: Statement I: The standard genetic code is considered nearly universal, with specific codons consistently functioning as stop signals across almost all domains of life. Statement II: The discovery of the 'Pyl code' in certain archaea demonstrates that the TAG codon can be reassigned to encode the amino acid pyrrolysine instead of terminating protein synthesis. Statement III: Such codon reassignment requires specialised cellular machinery, including distinct tRNA and aminoacyl-tRNA synthetase enzymes, to correctly incorporate pyrrolysine during translation. Which one of the following is correct in respect of the above statements?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Both Statement II and Statement III are correct, and both of them explain Statement I.
- 2Both Statement II and Statement III are correct, but only one of them explains Statement I.✓
- 3Only one of the Statements II and III is correct, and that explains Statement I.
- 4Neither Statement II nor Statement III is correct.
Correct answer
Both Statement II and Statement III are correct, but only one of them explains Statement I.
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