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(D) The genetic code is degenerate,meaning that some amino acids are encoded by more than one codon. This phenomenon is primarily due to the 'wobble h

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Third base of the codon

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(D) The genetic code is degenerate,meaning that some amino acids are encoded by more than one codon. This phenomenon is primarily due to the 'wobble hypothesis' proposed by Francis Crick. According to this hypothesis,the pairing between the third base of the codon (at the $3'$ end) and the first base of the anticodon (at the $5'$ end) is less strict and allows for non-canonical base pairing. Therefore,the third base of the codon is the most flexible,leading to the degeneracy of the genetic code.

Column $I$ (Codons)	Column $II$ (Amino acids)
$(A)$ $UUU$	$(I)$ Serine
$(B)$ $GGG$	$(II)$ Methionine
$(C)$ $UCU$	$(III)$ Phenylalanine
$(D)$ $CCC$	$(IV)$ Glycine
$(E)$ $AUG$	$(V)$ Proline

The degeneracy of the genetic code is due to the:

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