The toxin that causes the diarrheal disease cholera is the cholera enterotoxin called choleragen (CT). It has A and B subunit toxins: toxin A is responsible for enzymatic and intracellular functions, while toxin B is responsible for binding the toxin to the eukaryotic cell receptor.
Echinacea /ËÉkÉ¨ËneÉªÊâ±É/ is a genus, or group of herbaceous flowering plants in the daisy family. The Echinacea genus has nine species, which are commonly called purple coneflowers.They are found only in eastern and central North America, where they are found growing in moist to dry prairies and open wooded areas. They have large, showy heads of composite flowers, blooming from early to late summer.ome species are cultivated in gardens for their showy flowers. Echinacea purpurea is used in folk medicine. Two of the species, E. tennesseensis and E. laevigata, are listed in the United States as endangered species.
Echinoderms are characterized by their radial symmetry, water vascular system and internal skeleton. The most striking feature of all echinoderms is their pentamerous radial symmetry.That is, the body can be divided into five parts (or appendages) which point outward from the center of the body. Interestingly, although most mature echinoderms are radially symmetrical, the larvae usually have bilateral symmetry.ea stars, also known as âstarfishâ, are probably the most well known echinoderm of the sea. The common name âstarfishâ is quickly being replaced by the more accurate term âsea starâ. Since starfish have no relation to fish, the term âsea starâ is preferable.