Life is Cellular Chapter 7 Sec. 1.

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Presentation transcript:

Life is Cellular Chapter 7 Sec. 1

Discovery of the Cell 1665 Robert Hooke – slice of cork “little boxes”

Discovery of the Cell Anton van Leeuwenhoek 1673 – live cells

Cell Theory All living things are made of cells. Basic unit of structure and function in living things Cells come from other cells.

Cell Theory Schleiden – plants composed of cells Schwann – animals composed of cells Virchow – cells come from other cells

Cell Diversity Over 200 types in your body Size – some can be seen with eye and some are very small

Cell Size Volume increases faster than surface area Nutrients have to pass through cell surface to maintain homeostasis Limits size!!!!

Cell Shape Shape depends on function of cell.

Internal Organization Organelles – cell organs that perform a specific function

Internal Organization Cell Membrane – surrounds and protects the cell

Internal Organization Nucleus - cell’s brain (contains DNA)

Eukaryotes Eukaryotes – contain membrane bound nucleus

Prokaryotes Prokaryotes – lack a membrane bound nucleus and other organelles bacteria

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