Which two structures are first to combine in translation?

rRNA and tRNA is the two structure which combine in process of translation process.

Explanation:

Translation involves decoding a messenger. tRNAs is a specific amino acid and it pairs with mRNA codons which is inside the Ribosome. It covalently strung together. In this process each amino acid has a carboxyl and amino group.

Ribosome is catalyzed for this reaction and generate the one water molecule. It is a complex macro-molecule. It exists in the prokaryotes. Gene make the protein through the translation process. In translation process mRNA is decoded. At the resultant protein is build.