Rna interference (rnai) is a mechanism of gene silencing that is mediated by the presence of double-stranded rna. arrange the steps involved in gene silencing by rnai. a-target rna is degradedb-rna-induced silencing complex (risc) binds to short dsrnac-long dsrna is cleaved into short dsrnad-the sense strand is separated from the antisense strand and degraded. e-antisense rna pairs with the target rna