1.

What are the properties of Genetic code?

Answer»

The properties of genetic code are as follows:– 

(a) Triplet nature – The genetic code is a triplet code which is arranged in a sequence on m-RNA. 

(b) Unambiguous and specific – One codon codes for only one amino acid, hence it is unambiguous and specific. 

(c) Degenerate code – Some aminoacids are coded by more than one codon, hence the code is degenerate. 

(d) Commaless form – There are no comma and punctutation marks between the coding triplets (Codons). 

(e) Universal – The code is nearly universal. For example, from bacteria to human UUU would code for Phenylalanine (Phe). 

(f) Nonsense or Terminator Codon – Three of the 64 codons, namely UAA, UAG and UGA, do not specify any amino acids, but signal the end of the message. 

(g) Initiation codon – AUG and sometime GUG are the initiator codon. As AUG stands for methionine, polypeptide chain begins with methionine when they are synthesized. 



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