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  4. In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

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Q. In the genetic code dictionary, how many codons are used to code for all the $20$ essential amino acids?

Rajasthan PMTRajasthan PMT 2007

Solution:

Out of $64$ codons three (UAA, UAG, UGA) are chain terminating codons- the translating mechanism is not able to read these codons
(a) $61$ codons are used to code all the $20$ essential amino acids.
(b) Out of $64, 3$ codons, UAA, UAG, UGA does not code any amino acid molecule.