An uncommon form of this reaction can occur at normally unreactive W-X-X-W motifs. The progression of this reaction is usually depicted by the SNFG and Oxford notations as trees whose nodes consist of basic colored shapes. Cycles where this reaction is repeatedly performed and reversed (-5[1])allow calnexin to act as a quality control checkpoint (10[1])for misfolded proteins. (-5[1])A form of this reaction functionalizes (10[1])dolichol (“DOLL-ick-ol”) phosphate, (10[1])causing the newly formed molecule to flip (10[1])into the lumen. Localization of this reaction (10[1])depends on whether it uses asparagine (10[1]-5[1])or one of either serine or threonine (10[2]-5[1])as a reactant. The (10[1])O-linked and N-linked (10[2])forms (10[2])of this (10[2])post-translational (10[1])modification (10[1])are localized to the Golgi apparatus and endoplasmic reticulum, respectively. For 10 points, name this biochemical reaction in which a sugar is attached to a protein. (10[1])■END■ (10[4]0[3])