True or false. Explain your choice: There are at least 20 different tRNAs.

False. There are fewer than 20 different tRNAs because some amino acids share the same tRNA.

True. There are at least 20 different tRNAs because each ribosome uses a specific tRNA for its structure and function.

False. There are more than 64 different tRNAs because tRNAs correspond to all possible codons.

True. There are at least 20 different tRNAs, one for each of the 20 amino acids.