2 Protist characteristics Eukaryotic: having organelles and nucleusUnicellular or multicellularHeterotrophic, autotrophic, or saprobicMicroscopic or largeDivided into three major groups: protozoans, algae, and fungus-like protists
7 Helpful protistsAlgae through photosynthesis produce oxygen, that makes up the ozone layer.Algae and protozoans can also be part of the plankton that feeds marine animals.Fungus-like protists decompose matter and returns nutrients back to the soil.plankton
8 Freshwater algae asexually reproducing Protist reproductionMostly asexual: requiring one source of DNA for offspringSometimes sexual: requiring two sources of DNA for offspringFreshwater algae asexually reproducing
10 Major groups of protozoans AmoebaFlagellateCiliateSporozoan
11 Movement with pseudopods Pseudopod: “false foot”Amoeba, shapeless cells
12 Feeding with pseudopods The extensions of the cellular body surround food particles, which the amoeba then draws into itself for digestion.
13 Other amoeboid protozoans foraminiferansradiolarians
14 Movement with flagella This disease causing Giardia protozoan has flagella to move around.
15 Flagellates whip their tails back and forth to propel the cell.
16 Movement with ciliaNote the fine cilia that surround the paramecium, making a “halo glow.”Notice the starburst shaped organelle, the contractile vacuole that helps to pump out excess water.
17 Sporozoans: parasitic protozoans Disease causingProduces spores within host cellSpore: reproductive cell that forms without fertilization and produces a new organism
18 Plasmodium, cause of malaria The protist is transmitted through a mosquito bite to a human host.The protist reproduces inside the human red blood cells, making them puckered and unable to carry oxygen to the body.
37 slime molds, water molds, and downy mildews Fungus-like protistsslime molds, water molds, and downy mildews
38 Slime molds: most like true fungus Cool, moist environmentsAble to move around to feed during most of the life cycleTwo major types
39 Water molds and downy mildews Fuzzy white growth on decaying matter
40 How water molds and downy mildews feed They grow long extensions over the organic material and absorb nutrients through their cell membranes.A particular species infected the Irish potato crop and caused a large famine.