Question: (a) Why is the genetic code a triplet code instead of a singlet or doublet code? (b) How many different amino acids are specified by

(a) Why is the genetic code a triplet code instead of a singlet or doublet code? 

(b) How many different amino acids are specified by the genetic code? 

(c) How many different amino acid sequences are possible in a polypeptide 146 amino acids long?

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