For Each of the Following Sentences, Fill in the Blanks

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; use each word or phrase only once.
$\begin{array}{lll}\text { acetylation } & \text { methylation } & \text { riboswitch } \\\text { destruction } & \text { mitochondria } & \text { RISC } \\\text { Dicer } & \text { mRNA } & \text { rRNA } \\\text { DNA } & \text { phosphorylation } & \text { single-stranded RNA } \\\text { double-stranded RNA } & \text { prokaryotic } & \text { tRNA }\end{array}$

MicroRNAs are noncoding RNAs that are incorporated into a protein complex called __________, which searches the __________s in the cytoplasm for sequence complementary to that of the miRNA.When such a molecule is found, it is then targeted for __________.RNAi is triggered by the presence of foreign __________ molecules, which are digested by the __________ enzyme into shorter fragments approximately 23 nucleotide pairs in length.