2.2 Unicellular Organisms Text pages 43-47. The Big ideas What are unicellular organisms and how are they the same or different from multicellular organisms?

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Presentation transcript:

2.2 Unicellular Organisms Text pages 43-47

The Big ideas What are unicellular organisms and how are they the same or different from multicellular organisms?

2.2 Unicellular Organisms Unicellular organisms are called microorganisms – Only visible under a microscope – Have only one cell – Still does all 6 characteristics of living things – Some make us sick, some are important for us to survive

1. Bacteria Most plentiful Make own food or live off of a plant or animal (parasitic) Prokaryotic No nucleus, mitochondria or ribosomes See text page 44

2. Protists Eukaryotic Two types: 1.Plantlike protists (text page 44) -Can produce own food (have chloroplasts) -Diatoms, Euglena 2.Animal- Like Protists (text page 45 and 46) -Must feed on things that are or once were living -Amoebae, Paramecia

Any member of a class of unicellular algae, that live in cold waters of relatively low salinity. All have shell-like, brittle cell walls made out of silica (glass) and pectin. The walls, which are porous to allow materials in to and out of the cell, consist of two interlocking halves that fit together like a pillbox. Because they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species simply float in the water currents near the surface; others attach themselves to larger floating objects or to the sea floor. When diatoms die, they slowly sink to the seabed. The buildup of trillions of these shells forms a crumbly white sediment known as diatomaceous earth or diatomite, which is used in manufacturing pool filters and abrasives, including toothpaste.algaesilicapectinabrasives

Major Japanese oil wholesaler Nippon Oil and Hitachi subsidiary Hitachi Plant Technologies are developing a technology that’s supposed to make it possible to mass-produce eco-friendly jet fuel from Euglena, single-celled organisms that live in ponds and lakes. Nippon Oil Hitachi Plant TechnologiesEuglena

3. Fungi Can be multicellular or unicellular Bread mould, mushrooms, athletes foot, ringworm, yeast (unicellular)