NEET Botany Molecular Basis of Inheritance Questions Solved

Which of the following is nonsense codon?

(1) UAG

(2) UAA

(3) UGA

(4) all the above

(4) Nonsense codons (or terminating codons) are those codons which do not code for any of the 20 essential amino acids. UAA (ochre), UAG (amber) and UGA (opal) are three codons which when present in mRNA, would bring termination of polypeptide chain, which would then be released from the ribosome.

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