Stop codons are:
Correct answer: A. UAA,UAG,UGA
- A. UAA,UAG,UGA
- B. UGC,UCG,AAA
- C. UUG,UCG,UCA
- D. UAA,UGC,UCA
Explanation
Stop codons are codons (triplets of nucleotides) in messenger RNA (mRNA) that signal the termination of protein synthesis. Out of 64 codons, there are three stop codons: UAA, UAG, and UGA. These codons do not code for any amino acids hence, are known as nonsense codons. When a ribosome reaches a stop codon, it releases the amino acid chain that it has been building. This signals the end of protein synthesis.Stop codons are important for ensuring that proteins are the correct length. If a protein is not the correct length, it may not be functional. REMEMBER THEM ASUGA[ u go away]UAA [ u are away]UAG [ u are gone]
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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Ribonucleic acid is generally a single-stranded nucleic acid containing ribose and uracil instead of thymine. Coverage includes mRNA, tRNA and rRNA, complementary base pairing, transcription and translation, and the differences between RNA and DNA in structure, location and biological function.
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