How many types of tRNA are there in a cell? How do they differ from each other? How to explain that the number of types of tRNA

How many types of tRNA are there in a cell? How do they differ from each other? How to explain that the number of types of tRNA is greater than the number of types of amino acids found in proteins?

There are 40 types of tRNA in the cell, each of them has a nucleotide sequence that is characteristic only for it. The number of tRNA species is higher because only 20 amino acids are part of proteins.

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