Reverse transcriptases are enzymes encoded in retroviruses viral genome. The enzyme is responsible for transcription of the viral RNA to produce a dsDNA that can be inserted into the host genome.
Pacific Ocean Basin. The Pacific Ocean is bounded on the east by the North and South American continents; on the north by the Bering Strait; on the west by Asia, the Malay Archipelago, and Australia; and on the south by the Southern Ocean.
The Pacific Ocean covers ~1/3 of the earth's surface making it larger than all land masses combined. Although the largest, the Pacific Ocean is currently shrinking while the Atlantic Ocean is expanding due to plate tectonics. This is the same geological process that caused the break-up of Pangea.