 Most are unicellular  There are 3 groups  Animal like  Fungus like  Plant like  A protist is an eukaryote that is NOT a plant, animal or fungus

 Aka protozoans  They are heterotrophs – they eat prokaryotes and other protozoans  Many are parasites (living off other organisms i.e. where they live – at the expense of that organism)

 Ex. Amoeba  No cell walls, only cell membrane  Changes shape using cytoskeleton to move and create different forms  Creates pseudopod (refer to page 73 figure 2.18)  Lives in salt/fresh water, mud, inside animal hosts

 They have short hair like projections called cilia  They help in cell movement  Many speices are large and complex  Some are are free living, some are parasite

 Have one or more flagellum  Have hard protective covering  Some are free living, some are parasites, some exist in mutualistic relationships  Ex. Flagellates in intestines that help hosts digests plants

 These are parasites of animals  They alternate between sexual and asexual reproduction (Refer to pg 74 Figure 2.21)

 Heterotrophs  They have spores like fungi  Ex. Slime mould

 Visible to the naked eye  Slug like organism near damp, decaying plant materials  Contains many nuclei  Engulfs materials like an amoeba

 Exist as individual amoebid cells  Feeds by ingesting bacteria/ yeast cells

 Filamentous organisms  Live on dead organic material  Some are parasites  \Releases threads into hosts, then digestive enzymes, then absorbs nutrients

 Contain pigments in their chloroplast that allows for photosynthesis to occur

 Phytoplankton, single celled free floating aquatic oragnism  Rigid cell walls made of silica  Asexual, reproduce via mitosis most of the time  Sexually, if unfavourable conditions

 Most are phytoplankton  2 flagella perpendicular to each other  Reproduce very quickly  Sometimes, so quickly that it produces a “red tide”  Some dinoflagellates live in other organisms  Most exhibit mutualism

 Most are found in shallow fresh water  Conduct photosynthesis AND can absorb nutrients  Autotrophs in sunlight  Heterotrophs in absence of sunlight  Has light detectors called eyespots that allows the flagella to orient the euglenoid towards the light