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Microbiology 1.2 and 1.3 Most organisms on Earth are single celled (unicellular) 3 Different Categories of Cells/Life: 1. Archaea - prokaryotic, unicellular - have ribosomes and cell wall for protection - live in extreme environments (very hot hydrothermal vent). 2. Bacteria - prokaryotic, unicellular - ribosomes and cell wall 3. Eukarya - eukaryotic (have nucleus and organelles) - both multi- and uni-cellular What is a protist? Microscopic, mostly multi-cellular, live near water 4 different types: How do they get energy? How do they move? Image: Paramecium Sweep food into mouth Amoeba Surround food and absorb it “Verde” Volvox photosynthesis “hair-like” Cilia Pseudopod – “fake foot.” Colony with flagella – “whiplike tail” Euglena Photosynthesis AND consuming Flagella – “whip-like tail” Cells are specialized: work together to perform specific duties. Cells Tissues Organs Organ Systems Organisms Humans have 11 organ systems and over a trillion cells.