How many naturally occurring amino acids are there? How many different aminoacyl-tRNA synthetases?
a) There are 20 naturally occurring amino acids and 20 different aminoacyl-tRNA synthetases.
b) There are 21 naturally occurring amino acids and 21 different aminoacyl-tRNA synthetases.
c) There are 22 naturally occurring amino acids and 22 different aminoacyl-tRNA synthetases.
d) There are 19 naturally occurring amino acids and 19 different aminoacyl-tRNA synthetases.

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