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I don't understand the grouping of base pairs as 3 to make and identify an amino acid.

Is this just an arbitrary assignment?

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A codon is made up of exactly 3 base pairs - something worth remembering. Three base pairs (codon) will therefore code a specific amino acid (20 different types).

Also, the genetic code is degenerate, meaning that more than one codon can code for a particular amino acid.

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