ID #1797

How exactly does an anticodon know when to stop at the base pairs that is complimentary to it? And why is it doing that?

A tRNA only "fits" into the A site of a ribosome in a particular way, and when it slips in this way, there are only three bases that can physically come into contact with the mRNA. Those three bases are called the anticodon, and this serves to make sure that the next amino acid added to the growing protein chain is the right one.

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