Question

question 4
which one of the codons below would stop the translation of mrna by ribosomal subunits?
aug, atg, gtu
atg, aag, aaa
cug, aug, gua
uag, uaa, uga

Explanation:

In mRNA translation, stop codons signal the ribosome to halt protein synthesis. The three recognized stop codons are UAG (amber), UAA (ochre), and UGA (opal). These codons do not code for any amino acid but instead trigger the release of the newly synthesized polypeptide chain from the ribosome. Other codons like AUG are start codons (coding for methionine), and codons such as AAG, AAA code for amino acids (lysine in these cases). Codons like ATG and GTU are not valid mRNA codons (mRNA uses Uracil - U, not Thymine - T as in DNA; and codons are three - base sequences in mRNA). So, among the given options, only UAG, UAA, UGA are stop codons.

Answer:

UAG, UAA, UGA