NEET 2023 Phase 1 · BiologyPrevious Year Question
Given below are two statements: Statement I: The codon 'AUG' codes for methionine and phenylalanine. Statement II: 'AAA' and 'AAG' both codons code for the amino acid lysine. In the light of the above statements, choose the correct answer from the options given below:
Answer: (B) Statement I is incorrect but statement II is true. Answer: (B) Statement I is incorrect but statement II is true.
- A.Statement I is correct but statement II is false
- B.Statement I is incorrect but statement II is true✓
- C.Both Statement I and Statement II are true
- D.Both Statement I and Statement II are false
Correct Answer
(B) Statement I is incorrect but statement II is true
Solution & Explanation
Answer: (B) Statement I is incorrect but statement II is true. AUG codes for methionine and also acts as the initiator codon (not phenylalanine, which is coded by UUU/UUC), so Statement I is false; AAA and AAG both code for lysine (degeneracy of the code), so Statement II is true. NCERT Ch 5, p.96, lines 022-023: "AUG has dual functions. It codes for Methionine (met) , and it also act as initiator codon."
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