NEET 2003 Biology question

In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids : -

(1)20
(2)64
(3)61Correct
(4)60

Answer: (3)

Solution

There are 64 possible triplet codons . Of these, 3 (UAA, UAG, UGA) are stop codons and do not code for any amino acid. The remaining 61 sense codons, including

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Question ID VK-089269