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The three-dimensional structures of tRNAs are highly conserved for what reason?The reason is probably so that each can fit equally well onto the ribosome and carry out its functionThe binding site on the ribosomes defines the order of tRNA binding, so there is no need for tRNAs to show any structural variation.The presence of different amino acids on the acceptor stem provides any necessary distinguishing features.This statement is incorrect; the three dimensional structure of tRNA is not highly conserved. If it were, the ribosomes would not be able to determine the correct amino acid to accept.

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Answer:

The reason is probably so that each can fit equally well onto the ribosome and carry out its function

Explanation:

The three-dimensional structure  or tertiary structure of tRNAs is conserved and crucial for the interaction : it is L-shaped 3D structure that allows them to fit onto the ribosome (its  P and A sites). This is important for the function of tRNA: to be link between mRNA (carries the information from DNA) and ribosome (performs protein synthesis-translation).

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