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Cells - PowerPoint PPT Presentation


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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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Presentation Transcript
cells1
Cells
  • Smallest Unit of life
  • Levels of organization:
    • cells
    • tissue
    • organ
    • system
    • organism
single vs multiple
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
prokaryotes vs eukaryotes
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