Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Protists - cloudfront.net
Document related concepts
no text concepts found
Transcript
Protists Ch. 29 “The bridge between bacteria and animals.” What are Protists? - First eukaryotes - make up the Kingdom Protista - unifying characteristic: “eukaryote that is not a plant, animal, or fungus” - “Junk Drawer group” - 7 paraphyletic phylums Where did they come from? A Prokaryote ● lost cell wall ● membrane infolded to form nucleus and Endoplasmic reticulum ● became a Eukaryote Then Eukaryote ● gained mitochondria and chloroplast by engulfing other bacteria ○ Endosymbiosis: ‘living together in close association’ ○ mitochondria = aerobic bacteria ○ chloroplast = cyanobacteria Protista Topic for the Day By the end of class you will be able to: -identify and the features used to group Protists. -explain how Protists are the bridge to multicellularity. Defining Protists Characteristics used to group 1. Cell Surface 2. Locomotion 3. Food sources (Metabolism) 4. Reproduction strategy Cell Surfaces Some protists have: All protists have: - plasma membrane - extracellular matrix - form cell walls - Cysts (similar to endospores) - allow cell to go dormant - survive some harsh environments Plasma Membrane ECM Question: “Which cell surface does ALL protists have?” Locomotion - flagella - whip-like extension that rotates to move - cilia - short hair-like projections that wave back and forth - pseudopodia - extensions of the plasma membrane - filopodia - axopodia Flagella and Cilia Pseudopodia “False Feet” Filopodia Axopodia Question: “Which type of locomotion uses hundreds of little hairlike projections to help the cell swim?” Food Source (Metabolism) Phototroph - use photosynthesis to produce food Phagotroph - do phagocytosis; bring food particles into their body Osmotroph - ingest food that has been liquified Mixotroph - both phototrophic and heterotrophic Phototrophs Phagotroph Osmotroph Mixotrophs Euglena Question: “In which type of nutritional strategy does the cell bring the food into its body using phagocytosis?” Reproduction Strategy Asexual - Cell division (Mitosis) - one cell splits into two - Budding - a smaller individual buds off the original - Schizogony - one cell splits into 3 or more Reproductive Strategy Sexual - Meiosis - forming of sex cells (egg and sperm) - later fertilize each other Cell Division Budding Schizogony Meiosis Question: “Which type of reproduction strategy involves the formation of multiple nuclei and results in 3 or more cells being produced?”
