Why does the ribosome move along mRNA not smoothly, but intermittently, in triplets.

Two triplets of mRNA and, accordingly, two tRNA are located in the active center of the ribosome. The ribosome moves along the mRNA not smoothly, but intermittently, triplet after triplet. At each step, a new amino acid is attached. Transport RNAs move with their amino acid to the ribosome and “try on” their anticodon to the next mRNA codon located in the active center (complementary nucleotides fit well together, hydrogen bonds arise between them). If the anticodon is not complementary, then tRNA is removed into the cytoplasm to other ribosomes. If it turns out to be complementary, then tRNA is attached to the codon by hydrogen bonds.

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