Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?
Correct answer: D. UAG, UGA -Stop
- A. AUG, ACG -Start/methionine
- B. UUA, UCA -Leucine
- C. GUU, GCU -Alanine
- D. UAG, UGA -Stop
Explanation
AUG codes for methionine and is the initiation or start codon that starts the synthesis of the polypeptide. UAA (ochre), UAG (amber), and UGA (opal) do not specify any amino acid, so they are called termination codons. CUU, CUC, CUA, and CUG code for leucine, whereas GCU, GCC, GCA, and GCG code for alanine.
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