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18 January, 22:04

What do the letters of the DNA alphabet stand for?

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  1. 18 January, 22:13
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    DNA stands for Deoxyribo Nucleic Acid, and its letters (A) (C) (G) (T) all stand for Adenine, Cytosine, Guanine, and Thymine
  2. 18 January, 22:22
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    A and G (adenine and guanine), and two pyrimidines, C and T (cytosine and thymine); in mRNA, U (uracil) replaces T. The words of the alphabet comprise 3 letters, thus there are 43=64 permutations or words which are called codons. 61 of the 64 codons code for 1 of 20 amino acids. Since more than one codon codes for a particular amino acid the code is said to be redundant. Four of the 64 codons punctuate the message; one, AUG, is the start signal and three, UAG, UAA and UGA, are stop signals.
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