Which of the following processes allows scientists to 'knock-down' genes?

Question

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RNAi analysis (RNA interference) allows scientists to 'knock-down' genes by introducing small interfering RNAs (siRNAs) that bind to and degrade the mRNA produced by the target gene, thus reducing its expression. SAGE (Serial Analysis of Gene Expression) and CAGE (Cap Analysis of Gene Expression) are methods for quantifying gene expression levels, while CHIP-chip and DNA microchip are techniques for analyzing protein-DNA interactions.

Which of the Following Processes Allows Scientists to 'Knock-Down' Genes