A nucleic acid whose name mentions this structure is delivered by a vector into a cell in which it is processed by Drosha and Dicer, before being loaded onto the RISC.
This structure can be generated by reverse Hoogsteen bonding between two long, polypurine domains. In a form of next-gen sequencing, one of these structures containing a sequence of interest is stretched open by a magnetic field. A nucleic acid whose name mentions this structure is delivered by a vector into a cell in which it is processed by Drosha and Dicer, before being loaded onto the RISC. A motif described by this word consists of two antiparallel beta strands linked by a two to five residue loop. The minus strand of the tobacco ringspot virus was where a (*) ribozyme with this structure was first discovered. Either a small, interfering RNA or a short, this type of RNA can be designed to block expression of a specific gene. It's not "stem," but this word denotes a "loop" consisting of unpaired nucleotides on a single stranded RNA or DNA molecule that base-pairs to itself. For 10 points, all of these biological structures share a resemblance to what metal U-shaped object worn in the hair? 
This structure can be generated by reverse Hoogsteen bonding between two long, polypurine domains.
hairpin [or ribbon] 