Answer:
Francis Crick proposed the presence of an adapter molecule, i.e. tRNA. It has an amino acid binding site so it transports a specific amino acid to the site of protein synthesis. Functions of tRNAs tRNAs take place specific amino acids at particular points during polypeptide synthesis as per codons of mRNA. Codons are recognised by anticodons of rRNAs. They hold peptidyl chains over the mRNAs.
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