The document summarizes the history and key concepts of cell theory. It describes how Robert Hooke first observed "cells" using a compound microscope in 1665 and how Anton van Leeuwenhoek later observed pond water cells using a single lens microscope. It then outlines how Matthias Schleiden and Theodor Schwann established in the 1830s that plant and animal cells are the basic units of life. Rudolf Virchow later determined that new cells are produced from existing cells, establishing the three main concepts of cell theory - that all living things are composed of cells, cells are the basic functional units of life, and new cells arise from preexisting cells.

1. THE CELL Chapter 7

13. Robert Hook (1665) Englishman cork “cells” Compound microscope

15. Anton van Leeuwenhoek (1660’S) Holland Single lens microscope Pond water

17. Cells Basic units of life

18. Matthias Schleiden (1838) German botanist Plant cells

19. Theodor Schwann (1839) German biologist Animal cells

20. Rudolf Virchow (1855) German physician New cells could only come from the division of existing cells

21. Cell Theory All living things are compose of cells Cells are the basic units of structure and function in living things New Cells are produced from existing cells

22. Lots of different shapes and sizes of cells

25. Sizes 5 to 50 micrometers How big is a micrometer? 1m=100cm=1,000,000 micrometers 1 micrometer=.000001m Basically you can’t see it Remember: KHDmDCM..micro..nano..pico

26. Chaos chaos Largest protozoan You can see without microscope 1000 micrometers How many meters is this? .001 m How many centimeters is this? 0.1 cm

27. 2 things in every cell… Surrounded by a barrier, cell membrane At some point in their life they contain…. DNA