This test is only done in combination with the initial screening test. HIV RNA tests: The HIV RNA is different than all human RNA, and tests have been developed to detect HIV RNA in a person's blood. This uses a type of test called a polymerase chain reaction (PCR).
Taxonomy refers to the official classifications of plants or animals according to accepted scientific standards and norms. As a group, sharks belong to the superorder called Selachimorpha. They are in the Chondrichthyes class (along with Chimaeras) under the subclass Elasmobranchii.This subclass is also where rays and skates fall and some sharks are thought to be very closely related to certain ray species (even more so than to other sharks, in fact). Selachimorpha is split into Galea and Squalea.The Galea group comprises:his subclass is also where rays and skates fall and some sharks are thought to be very closely related to certain ray species (even more so than to other sharks, in fact). Selachimorpha is split into Galea and Squalea. The Galea group comprises:
There are more than 400 different shark species, most of which can be found in coastal regions. They are present in every ocean of the world, with some species also inhabiting rivers. Sharks belong to the class of cartilaginous fish along side rays and chimeras.While the skeleton of all other fish is made of bone, the skeleton of sharks is made of cartilage. Cartilage is lighter and more flexible than bone allowing the shark to make tight turns quickly and to stay afloat.harks are a remarkably diverse group of fish. The largest species â the whale shark â can grow up to 12 meters in length while the smallest species â the dwarf lanternshark â only reaches a size of 17 centimeters.