There are 64 sense codons in the genetic code and 61 different types of tRNA molecules.

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Quizplus · Accepted Answer

There are indeed 64 sense codons in the genetic code. However, there are only 20 different types of tRNA molecules that are responsible for carrying the 20 different amino acids used to build proteins. Each type of tRNA can recognize and bind to more than one codon in the genetic code, through the use of specific base-pairing between the anticodon on the tRNA and the codon on the mRNA. This is how the genetic code can be read and translated into proteins by the ribosome.

There Are 64 Sense Codons in the Genetic Code and 61