S Ribosome

Basic components

Detailed composition

The Genetic Code Dictates the Amino Acid Sequence of Proteins 67

FIGURE 3.20 The Genetic Code

A codon consisting of three base pairs determines each amino acid to be added to a growing polypeptide chain. The codon table shows the 64 different codons, in RNA language, alongside the amino acids they encode. Three of the codons act as stop signals. AUG (methionine) and GUG (valine) act as start codons.

2nd (middle) base

1st base

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