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:
Taxonomic levels. I have already mentioned that there are at least 76 taxonomic levels that one could use to build a detailed classification.âSeven taxa are, however, usually sufficient, and they are: Kingdom; Phylum (from the Greek phulon, meaning âraceâ); Class; Order; Family; Genus; and Species.f we dig a little deeper and look at an example of a âstandardâ classification, we can see how these taxa are arranged.âIn the structure below I have set out the currently accepted taxonomic scheme for that most infamous of all sharks: the Great White (right).