2Protist characteristics Protists are organisms that do not fit into any other kingdom. They can either by uni-celled or simple multicellular. They can be animal-like, plant-like, or fungus-like.Protists are made up of eukaryotic cells, each containing a nucleus and other organelles.
3Protist characteristics A hypothesis for how eukaryotic cells arose:From prokaryotes that obtained organelles via endosymbiosis.Protists are often classified:By how the resemble fungi, plants, or animalsMost protists are unicellular such as an amoeba. Some of these unicellular protists form colonies in which several cells are joined into a larger body, such as Volvox.
4Protist characteristics A few protists are multicellular, such as Brown algae. They have specialized regions for reproduction, photosynthesis, and attachment to the ocean floor, but lack true tissues and organs.
5Protist characteristics Two ways in which protists obtain energy:AutotrophyHeterotrophy
7Protist characteristics Protists reproduce:Asexually either binary or multiple fissionSexually conjugation
8Animal-Like Protists Phylum Protozoa Single-celled protists that can move independently without cilia or flagellaHave pseudopodia which are large, rounded cytoplasmic extensions that function both in movement and feeding. They engulf small organisms.Move by amoeboid movement, which is a form of cytoplasmic streaming.An example of a Protozo is an AmoebaHarmful to humans in that some can live in human intestines and attack the lining, and may cause disease
9Animal-Like Protists Phylum Ciliophora They share one key feature: they have cilia which are: short, hair like cytoplasmic projections that line the cell membrane.Cilia make it possible for these protists to move.An example of Ciliophora is Paramecia.The process in which two Paramecia come together after meiosis to exchange parts of their genetic material is called conjugation.
10Plant-like Protists Algae Many plant-like protists are known as algae. Algae are autotrophic protists and have chloroplasts and produce their own carbohydrates by photosynthesis, as plants do. They do not have true roots, stems, or leaves.
11Plant and Animal-like Protists Phylum EuglenophytaPhylum Euglenophyta contain flagellated unicellular algae called euglenoids, which are both plant-like and animal-like.How are they like plants?Autotrophic, contain chlorophyllHave contractile vacuole and chloroplastHow are they like animals?Lack a cell wall and are highly motileIf raised in dark, do not form chloroplast and become heterotrophs
12Plant and Animal-like Protists Where do you find Euglena?In fresh water, especially water polluted by excess nutrientsHow do they move?Long flagellum
13Fungus-like Protists Slime mold- can either be: *mobile, amoeba-like feeding*sessile, reproductive spore-bearing formWater mold- composed of branching filaments of cells
14Protists and Humans Environmental roles of protist producers: Produce oxygenForm the foundation of food websRecycle materials
15Protists and HumansProtists symbiosis:Corral, fungi, and termites
16Protists and Humans Protists for food: Seaweeds are eaten directly Byproducts are used to make cheeses, ice cream, salad dressing, and bakery items.
17Protists and Humans People use: Alginate is used in cosmetics Carageenan is used in gelatin capsulesAgar is used to culture microbes
18Protists and Humans What is Giardiasis? Caused by Giardia lamblia Reults in diarrhea and cramps
19Protists and Humans What is Cryptosporidiosis? Caused by Cryptosporidium paruumCharacterized by diarrhea
20Protists and Humans What is Trichomoniasis? Caused by Trichomona vaginalisAn STD that causes discolored discharge and genital itching.