Which one of the following is not the stop codon?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → UUA
The genetic code has 64 codons. Of these, 61 code for amino acids, and three are stop (terminator) codons: UAA, UAG and UGA. They do not code for any amino acid, so translation ends there.
(1) UGA — A stop codon.
(2) UUA — Not a stop codon. It codes for the amino acid leucine.
(3) UAA — A stop codon.
(4) UAG — A stop codon.
NCERT Extract:
Genetic Code – …
