Practice question

SYBR Green is an asymmetrical cyanine dye that intercalates into the minor groove of any double-stranded DNA without sequence recognition. Fluorescence increases over thousand-fold upon binding, providing signal proportional to total double-stranded product accumulation. In contrast, TaqMan, molecular beacons and Scorpion probes rely on complementary hybridization of oligonucleotide sequences containing fluorophore and quencher, thus discriminating specific amplicons from nonspecific products. Melting curve analysis is required with SYBR Green to verify product identity, as primer-dimers and off-target amplicons also generate fluorescence. Hence it reports amplification but lacks inherent sequence discrimination.