In the genetic code dictionary how many codons are used to code for all the 20 essential amino acids?
(A) 20
(B) 64
(C) 61
(D) 60

C)61
Of all the 64 codons, three are known as termination codons or stop codons, which do not code for any amino acid. They are UAA, UAG and UGA. They act as stop signals for protein synthesis. Remaining 61 codons code for 20 known amino acids.