All protists are eukaryotic, meaning they feature a cellular structure with nuclei to contain their genetic material. Also called protozoans, which means "first animals," all protists prefer a moist environment and are found where there is perpetually moist soil or in freshwater and saltwater bodies of water.Know More
Along with the nucleus, most protists also feature mitochondria which aid in metabolic functions, and vacuoles which aid in digestion. This means that despite sometimes being of very small size, protists are relatively complex organizations from a functional standpoint.
Other than these basic similarities, the nature and features of protists vastly vary. They may be unicellular or multicellular and range in size from microscopic to 300 feet in length. However, even in the largest multicellular protists, there is no cellular specialization or differentiation in tissues types. While protists are not classified as plants, animals or fungi, they may display plant-like, animal-like or fungi-like characteristics.
The Kingdom Protista was established by the scientist Ernst Haeckel in 1866. It was not officially recognized by the larger scientific community until a century later in the 1960's. The Kingdom Protista is often called a"junk drawer" since it comprises all the eukaryotics that cannot be classified into any other kingdom.Learn more about Biology
Bacterial transduction is the process by which a bacterium's genetic material is transferred to a second bacterium through a viral medium. The types of viruses that can carry out this process are called bacteriophages, which preferentially infect bacteria and use them to produce virus progeny.Full Answer >
Prokaryotic and eukaryotic cells differ in many ways, notably in the structure of their cell walls, the arrangement of their genetic material and their internal arrangement of cellular machinery. Eukaryotes, a group that encompasses all large organisms, also tend to reproduce sexually, while prokaryotes show more variation in reproductive methods.Full Answer >
The roles of protists include producing and using energy, recycling living systems into constituent nutrients, acting as biological control agents, synthesizing oxygen, and engaging in symbiotic relationships. Protists have commercial roles in the pharmacological, agricultural and biomedical research industries.Full Answer >
Some harmful protists include plasmodium, gregarines, haemosporidia and coccidians. Others include babesia, toxoplasma, adeleorina and some forms of amoeba. Some of these protists are parasites on invertebrates such as gastropods while others are parasites on vertebrates such as humans.Full Answer >