NEET 2023 Phase 2 · BiologyPrevious Year Question
The salient features of genetic code are : (A) The code is palindromic (B) UGA act as initiator codon (C) The code is unambiguous and specific (D) The code is nearly universal Choose the most appropriate answer from the options given below :
Answer: (B) (C) and (D) only. Answer: (B) (C) and (D) only.
- A.(A) and (B) only
- B.(C) and (D) only✓
- C.(B) and (D) only
- D.(A) and (C) only
Correct Answer
(B) (C) and (D) only
Solution & Explanation
Answer: (B) (C) and (D) only. The genetic code is unambiguous/specific (one codon codes one amino acid) and nearly universal, so (C) and (D) are correct. (A) is wrong (the code is not palindromic) and (B) is wrong (UGA is a stop codon, AUG is the initiator). The intended key 'B' corresponds to the option meaning '(C) and (D) only'. NCERT Ch 5, p.96, lines 018-024: "The code is nearly universal: for example, from bacteria to human UUU would code for Phenylalanine"; "UAA, UAG, UGA are stop terminator codons."
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