Answer :
The correct answer for this question is 16
It was also recognized that mRNA contains only four nucleotides: adenine (A), uracil (U), guanine (G), and cytosine (C) (C). Thus, only four distinct bases in mRNA code for 20 amino acids,
A doublet code could code for 16 amino acids (4 x 4). A triplet code could make a genetic code for 64 different combinations (4 X 4 X 4) genetic code and provide plenty of information in the DNA molecule to specify the placement of all 20 amino acids. When experiments were performed to crack the genetic code, it was found to be a code that was triplet. These three letter codes of nucleotides (AUG, AAA, etc.) are called codons.
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