A) the codons degenerate soon after the synthesis of polypeptide chain
B) one codon can code for more than one amino acids
C) a codon is non-functional and is also known as non-sense codon
D) the same amino acid can be coded by more than one codon.
Correct Answer: D
Solution :
: Multiple codons decoding the same amino acid is termed as degeneracy. The code contains many synonyms, i.e., almost all amino acids are represented by more than one codon. Many of the synonym codons specify the same amino acid (degenerate code) e.g., arginine. The first two bases of the triplet are constant whereas third can vary e.g., all codons starting with CC specify proline (CCU, CCC, CCA, CCG) and all codons starting with AC specify threonine and both UAC and UAU code for tyrosine. Degeneracy of code is permitted because there are 64 possible permutations of triplets made from the four different bases, but only 20 amino acids and stop signals to be coded.
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