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Cells

Cells. Cells. Smallest Unit of life Levels of organization: cells tissue organ system organism. One cell is whole organism Cells all look the same all do the same job Small Simple organisms paramecium, Euglena. Many cells working together

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Cells

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  1. Cells

  2. Cells • Smallest Unit of life • Levels of organization: • cells • tissue • organ • system • organism

  3. One cell is whole organism Cells all look the same all do the same job Small Simple organisms paramecium, Euglena Many cells working together Specialization – cells have different jobs (nerve and muscle cells) Large complex organisms Plants and animals Single vs. Multiple

  4. Ancient – 3.5 bya no nucleus Small 1-10 um circular DNA No membrane – bound organelles Only ribosomes Newer – 1.5 bya Nucleus Larger – 2-1,000 um Linear DNA Lots of membrane-bound organelles Prokaryotes vs. Eukaryotes

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