Question

The codons causing gene termination are:

• A. UAA
• B. UAG
• C. UUU
• D. UGA

Hint:

Remember stop codons with the mnemonic: "U Are Annoying" (UAA), "U Are Gone" (UAG), "U Go Away" (UGA).

Answer 1

The Correct Option is A

Step 1: A stop codon has no matching tRNA or amino acid, it is read instead by a release factor.
Step 2: UUU does code for an amino acid (phenylalanine), so it is not a stop codon.
Step 3: UAA, the "ochre" codon, has no tRNA and is recognised by release factors, terminating translation.
Step 4: Correct answer, UAA.