Cells Smallest living unit Most are microscopic.

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Cell Structure and Function
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Presentation transcript:

Cells Smallest living unit Most are microscopic

Discovery of Cells Robert Hooke (mid-1600s) Observed sliver of cork Saw “row of empty boxes” Coined the term cell

Principles of Cell Theory All living things are made of cells Smallest living unit of structure and function of all organisms is the cell All cells arise from preexisting cells (this principle discarded the idea of spontaneous generation)

Characteristics of All Cells A surrounding membrane Protoplasm – cell contents in thick fluid Organelles – structures for cell function Control center with DNA

Prokaryotic Cells No membrane bound nucleus Nucleoid = region of DNA concentration Organelles not bound by membranes

Eukaryotic Cells Nucleus bound by membrane Include fungi, protists, plant, and animal cells Possess many organelles Protozoan

Representative Plant Cell

Representative Animal Cell

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