Concept $18\mathrm{.}3$ Noncoding RNAs play multiple roles in controlling gene expression

$q,$

RNA Processing, Alternative Splicing, Regulation of Translation and mRNA Degradation, Protein Processing and Degradation

when different mRNA molecules are produced from the same primary transcript, depending on which RNA segments are treated as exons and which as introns

small, single$-$stranded RNA molecules capable of binding ts complementary sequences in mRNA and prevent their translation

The blocking of gene expression by small interfering RNAs, used in the laboratory as a means of disabling specific genes to investigate their function