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B
Non-sense codons
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C
Degenerate codons
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D
Chain initiator codons
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Solution
The correct option is B Non-sense codons
Non-sense codons are the codons for which no normal tRNA exists. They do not code for any amino acid and their presence leads to their termination of the translation. Eg: UAA, UGA, UAG
Non-overlapping codon means the successive triplets are read in order. Each nucleotide in the sequence is a part of only one codon. Three nucleotides specify one amino acid in a protein. Eg: AUGUUUCGA.... will always code for methionine-phenylalanine-arginine...
Degeneracy of codons means different triplet codons can code for a particular amino acid. Eg: glutamic acid is coded by GAA and GAG. leucine is coded by UUA, UUG, CUU, CUC, CUA, CUG
Chain initiator codon is the first codon of a mRNA transcript translated by a ribosome. AUG codes for methionine, since methionine is the chain initiator amino acid.