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Eukaryotic organisms that did not fit the criteria for the kingdoms Animalia, Fungi, or Plantae historically were called protists and were classified into the kingdom Protista. There are over 100,000 described living species of protists, and it is unclear how many undescribed species may exist. Nearly all protists exist in some type of aquatic environment, including freshwater and marine environments, damp soil, and even snow. Single protist cells range in size from less than a micrometer to the 3-meter lengths of the multinucleate cells of the seaweed Caulerpa.
The majority of protists are motile, but different types of protists have evolved varied modes of movement. Some heterotrophs absorb nutrients from dead organisms or their organic wastes, and others are able to use photosynthesis or feed on organic matter, depending on conditions. With the advent of DNA sequencing, the relationships among protist groups and between protist groups and other eukaryotes are beginning to become clearer.
Many protists are pathogenic parasites that must infect other organisms to survive and propagate. Members of the genus Plasmodium must infect a mosquito and a vertebrate to complete their life cycle.
This movie depicts the pathogenesis of Plasmodium falciparum, the causative agent of malaria.
This movie discusses the pathogenesis of Trypanosoma brucei, the causative agent of African sleeping sickness.
Phytophthora infestans is an oomycete responsible for potato late blight, which causes potato stalks and stems to decay into black slime ([link]b). Protists play critically important ecological roles as producers particularly in the world’s oceans. Protists themselves and their products of photosynthesis are essential—directly or indirectly—to the survival of organisms ranging from bacteria to mammals.
Many fungus-like protists are saprobes, organisms that feed on dead organisms or the waste matter produced by organisms (saprophyte is an equivalent term), and are specialized to absorb nutrients from nonliving organic matter.
Protists are extremely diverse in terms of biological and ecological characteristics due in large part to the fact that they are an artificial assemblage of phylogenetically unrelated groups. The process of classifying protists into meaningful groups is ongoing, but genetic data in the past 20 years have clarified many relationships that were previously unclear or mistaken. Protists with the capabilities to absorb nutrients from dead organisms are called_____________. Which parasitic protist evades the host immune system by altering its surface proteins with each generation?
The trypanosomes that cause this disease are capable of expressing a glycoprotein coat with a different molecular structure with each generation.
In general, animals fall into three categories: – Herbivores eat mainly autotrophs (plants and algae). Animals need a source of organic carbon and organic nitrogen in order to construct organic molecules. The remaining amino acids, the essential amino acids must be obtained from food in preassembled form.
The essential fatty acids are certain unsaturated fatty acids that must be obtained from the diet. Mammalian accessory glands are the salivary glands, the pancreas, the liver, and the gallbladder.
Protists include the single-celled eukaryotes living in pond water ([link]), although protist species live in a variety of other aquatic and terrestrial environments, and occupy many different niches.
Since many protists live in symbiotic relationships with other organisms and these relationships are often species specific, there is a huge potential for undescribed protist diversity that matches the diversity of the hosts. Photosynthetic protists (photoautotrophs) are characterized by the presence of chloroplasts. Most are capable some form of asexual reproduction, such as binary fission to produce two daughter cells, or multiple fission to divide simultaneously into many daughter cells. Many relationships that were based on morphological similarities are being replaced by new relationships based on genetic similarities.
Protist parasites include the causative agents of malaria, African sleeping sickness, and waterborne gastroenteritis in humans.
In vertebrates, the parasite develops in liver cells and goes on to infect red blood cells, bursting from and destroying the blood cells with each asexual replication cycle ([link]). The oomycete Plasmopara viticola parasitizes grape plants, causing a disease called downy mildew ([link]a).

For instance, certain anaerobic species exist in the digestive tracts of termites and wood-eating cockroaches, where they contribute to digesting cellulose ingested by these insects as they bore through wood. Protists display highly varied cell structures, several types of reproductive strategies, virtually every possible type of nutrition, and varied habitats.
However, they must complete part of their life cycle within Anopheles mosquitoes, and they can only be transmitted to humans via the bite wound of a mosquito. Because the immune system must respond to specific antigens to raise a meaningful defense, the changing nature of trypanosome antigens prevents the immune system from ever clearing this infection.
A diet that provides insufficient essential amino acids causes malnutrition called protein deficiency.
Individuals who eat only plant proteins need to eat specific plant combinations to get all essential amino acids. Insights into human nutrition have come from epidemiology, the study of human health and disease in populations. Intracellular digestion, food particles are engulfed by endocytosis and digested within food vacuoles. Not all protists are microscopic and single-celled; there exist some very large multicellular species, such as the kelps.
As the catchall term for eukaryotic organisms that are not animals, plants, fungi, or any single phylogenetically related group, it is not surprising that few characteristics are common to all protists. A parasite is an organism that lives on or in another organism and feeds on it, often without killing it.
A few protists live as colonies that behave in some ways as a group of free-living cells and in other ways as a multicellular organism.
Others are encased in glassy silica-based shells or wound with pellicles of interlocking protein strips. Other protists are heterotrophs and consume organic materials (such as other organisms) to obtain nutrition.
Others produce tiny buds that go on to divide and grow to the size of the parental protist. Protists that exhibit similar morphological features may have evolved analogous structures because of similar selective pressures—rather than because of recent common ancestry. The glycoproteins are identified by the immune system as foreign matter, and a specific antibody defense is mounted against the parasite. Alternatively, photosynthetic protists serve as producers of nutrition for other organisms by carbon fixation.
The actual enzyme used to digest the cellulose is actually produced by bacteria living within the protist cells.
Saprobic protists have the essential function of returning inorganic nutrients to the soil and water.
Most single-celled protists are motile, but these organisms use diverse structures for transportation.
The goal of this classification scheme is to create clusters of species that all are derived from a common ancestor. If the mosquito population were decreased, then fewer Plasmodium would be able to develop and be transmitted to humans, thereby reducing the incidence of human infections with this parasite. Some animals have adaptations that help them through periods when their bodies demand extraordinary amounts of protein. Neural tube defects were found to be the result of a deficiency in folic acid in pregnant mothers. During the past two decades, the field of molecular genetics has demonstrated that some protists are more related to animals, plants, or fungi than they are to other protists. A few protist species live on dead organisms or their wastes, and contribute to their decay. Still other protists are composed of enormous, multinucleate, single cells that look like amorphous blobs of slime or, in other cases, like ferns.
The pellicle functions like a flexible coat of armor, preventing the protist from being torn or pierced without compromising its range of motion.
Still others send out lobe-like pseudopodia from anywhere on the cell, anchor the pseudopodium to a substrate, and pull the rest of the cell toward the anchor point. Amoebas and some other heterotrophic protist species ingest particles by a process called phagocytosis, in which the cell membrane engulfs a food particle and brings it inward, pinching off an intracellular membranous sac, or vesicle, called a food vacuole ([link]).
Sexual reproduction, involving meiosis and fertilization, is common among protists, and many protist species can switch from asexual to sexual reproduction when necessary.
Late blight continues to plague potato crops in certain parts of the United States and Russia, wiping out as much as 70 percent of crops when no pesticides are applied.

For instance, photosynthetic dinoflagellates called zooxanthellae pass on most of their energy to the coral polyps that house them ([link]). The termite provides the food source to the protist and its bacteria, and the protist and bacteria provide nutrients to the termite by breaking down the cellulose. This process allows for new plant growth, which in turn generates sustenance for other organisms along the food chain.
It can have specialized regions that carry out digestion and absorption in a stepwise, efficient fashion.
For this reason, protist lineages originally classified into the kingdom Protista have been reassigned into new kingdoms or other existing kingdoms. In fact, many protist cells are multinucleated; in some species, the nuclei are different sizes and have distinct roles in protist cell function.
Some protists can move toward light by coupling their locomotion strategy with a light-sensing organ. This vesicle then fuses with a lysosome, and the food particle is broken down into small molecules that can diffuse into the cytoplasm and be used in cellular metabolism. Sexual reproduction is often associated with periods when nutrients are depleted or environmental changes occur. In 2010, it was estimated that malaria caused between 0.5 and 1 million deaths, mostly in African children.
The parasite inhabits heart and digestive system tissues in the chronic phase of infection, leading to malnutrition and heart failure caused by abnormal heart rhythms. The spread of downy mildew caused the near collapse of the French wine industry in the nineteenth century. In this mutually beneficial relationship, the polyps provide a protective environment and nutrients for the zooxanthellae. Indeed, without saprobic species, such as protists, fungi, and bacteria, life would cease to exist as all organic carbon became “tied up” in dead organisms.
Sexual reproduction may allow the protist to recombine genes and produce new variations of progeny that may be better suited to surviving in the new environment.
The emerging classification scheme groups the entire domain Eukaryota into six “supergroups” that contain all of the protists as well as animals, plants, and fungi ([link]); these include the Excavata, Chromalveolata, Rhizaria, Archaeplastida, Amoebozoa, and Opisthokonta. An estimated 10 million people are infected with Chagas disease, which caused 10,000 deaths in 2008.
In the meantime, the term “protist” still is used informally to describe this tremendously diverse group of eukaryotes. However, sexual reproduction is also often associated with cysts that are a protective, resting stage. The supergroups are believed to be monophyletic; all organisms within each supergroup are believed to have evolved from a single common ancestor, and thus all members are most closely related to each other than to organisms outside that group. Without dinoflagellate symbionts, corals lose algal pigments in a process called coral bleaching, and they eventually die. As a collective group, protists display an astounding diversity of morphologies, physiologies, and ecologies. Depending on their habitat, the cysts may be particularly resistant to temperature extremes, desiccation, or low pH.
In response to waste products released as the parasites burst from infected blood cells, the host immune system mounts a massive inflammatory response with delirium-inducing fever episodes, as parasites destroy red blood cells, spilling parasite waste into the blood stream.
Without treatment, African sleeping sickness leads invariably to death because of damage it does to the nervous system. This explains why reef-building corals do not reside in waters deeper than 20 meters: Not enough light reaches those depths for dinoflagellates to photosynthesize. This strategy also allows certain protists to “wait out” stressors until their environment becomes more favorable for survival or until they are carried (such as by wind, water, or transport on a larger organism) to a different environment because cysts exhibit virtually no cellular metabolism.
Greater surveillance and control measures have led to a reduction in reported cases; some of the lowest numbers reported in 50 years (fewer than 10,000 cases in all of sub-Saharan Africa) have happened since 2009.
Techniques to kill, sterilize, or avoid exposure to this highly aggressive mosquito species are crucial to malaria control.

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