Reverse transcriptase is characteristic of retroviruses, including HIV (human immunodeficiency virus), the virus responsible for AIDS (acquired immunodeficiency syndrome). All retroviruses encode a polymerase enzyme in their pol gene that is both necessary and sufficient for the replication of their RNA genomes.
PDO positive phase global pattern. The Pacific Decadal Oscillation (PDO) is a robust, recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.
Transform boundaries form where two plates slide past each other. These boundaries are characterized by shallow earthquakes. This satellite photograph shows Point Reyes, California, and the San Andreas Fault. Here the Pacific Plate is sliding past the North American Plate.The San Andreas Fault, an example of a transform fault, where two plates slide past each other.Numerous earthquakes occur along the San Andreas Fault, which passes through highly populated areas of California.(Photograph courtesy of NASA).ransform boundaries form where two plates slide past each other. These boundaries are characterized by shallow earthquakes. This satellite photograph shows Point Reyes, California, and the San Andreas Fault. Here the Pacific Plate is sliding past the North American Plate.