Sample Questions — Genetic code
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MCQ
The poly(U) RNA sequence was used by Nirenberg to determine that:
✅ Correct Answer: C
Nirenberg used synthetic RNA to show UUU codon specifies phenylalanine.
MCQ
6. Choose the correct statements:
I. Codons are read from 3′ → 5′ direction
II. AUG is both start codon and codes methionine
III. UGA is a stop codon
IV. Codon usage is species-specific
✅ Correct Answer: A
Codons are read from 5′ → 3′ and code is universal, not species-specific.
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MCQ
Why was Khorana’s method important in confirming the triplet nature of codons?
✅ Correct Answer: B
Khorana could assign codons to amino acids using defined synthetic RNAs.
MCQ
What characteristic of the genetic code ensures that each codon codes for only one amino acid?
✅ Correct Answer: C
Genetic code is non-ambiguous—each codon specifies only one amino acid.
MCQ
11. Assertion (A): Genetic code is regenerate.
Reason (R): More than one codon can code for a single amino acid.
✅ Correct Answer: D
Genetic code is degenerate. Degeneracy refers to multiple codons specifying the same amino acid.
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