Small modifications to these compounds can be produced at mass when they are synthesized on a semiconductor scaffold by the company Twist. A methylene bridge can cause inaccessibility due to ring puckering in the “locked” version of these compounds. DMT is used as a protecting agent in the phosphoramidite (10[1])(“phosphor-AM-uh-dite”) method of synthesizing these compounds. Short samples of these compounds are layered on top of a scaffold to form 3D structures of them nicknamed “origami.” The melting temperature of these compounds increases with the number of subunits that can form 3 hydrogen bonds instead of 2. Each subunit of these compounds consists of a phosphate, a 5-carbon sugar, and either a pyrimidine (10[1])or purine. For 10 points, name this class of compounds exemplified by DNA and RNA. ■END■