There are three kinds of RNA molecules produced during transcription: • Messenger RNA (mRNA) is a single strand of RNA that provides the template used for sequencing amino acids into a polypeptide. A triplet group of three adjacent nucleotides on the mRNA, called a codon, codes for one specific amino acid. There are 64 possible ways that four nucleotides can be arranged in triplet combinations (4 × 4 × 4 = 64 possible codons). The genetic code is a table of information that provides “decoding” for each codon—that is, it identifies the amino acid specified by each of the possible 64 codon combinations. For example, the codon composed of the three nucleotides cytosine-guanine-adenine (CGA) codes for the amino acid arginine. Refer to Figure 5. How to use the chart: 1.
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