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Which of the following is an oxidation-reduction reaction? (pictured below)

Put the following processes of protein synthesis in the correct order: - dna strands unwind and separate - mrna copies dna according to complimentary base pairing - trna's anticodons bring amino acids to the corresponding mrna codons - amino acids bind to each other making a protein - mrna leaves the nucleus - a stop codon is reached, the newly formed protein is released to go do its job for the cell

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?