Cell Scientists, Cell Size, and Cell Specialization Chap 7-1 http://www.parlament-berlin.de/Galeriecopy.nsf/0/8ABC720262898739C1256A480037F869?OpenDocumen http://www.ncu.edu.tw/~ls/graph/faculty_pictures/whole_time/SLC/SLC_lab-1.jpg t

Robert Hooke 1665- ______________________ used a microscope to examine a thin slice of cork, a plant material, and saw “little boxes.” Robert Hooke He called them “CELLS” because they looked like the small rooms that monks lived in called cells. Microscope image: http://www.answers.com/topic/microscope Cork image: http://www.cortex.de/img_kork/cork_cells_big.jpg Hooke image: http://www.metaweb.com/wiki/upload/5/5c/Hookeyoungmtwb.jpg

Anton van Leeuwenhoek 1673- ___________________________________ a Dutch microscope maker was the first to see LIVING UNICELLULAR ORGANISMS in pond water. Anton van Leeuwenhoek Microscope/Leeuwenhoek image: http://www.answers.com/topic/microscope Animation from: http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm

Soon after Van Leeuwenhoek… Observations made it clear that CELLS were the basic units of life. Unicellular- one-celled Multicellular- many-celled

1838- German botanist __________________________concluded that ALL PLANTS are made of cells Matthias Schleiden Plant image: http://www.epa.gov/maia/images/classification.gif Schleiden image: http://web.visionlearning.com/events/Schleiden_Apr5_2005.htm

Theodor Schwann 1839- German zoologist _________________________concluded that Theodor Schwann ALL ANIMALS ARE MADE OF CELLS Schwann image: http://home.tiscalinet.ch/biografien/biografien/schwann.htm Animals image: http://animaldiversity.ummz.umich.edu/index.htm

Rudolph Virchow 1855- German medical doctor _____________________ saw dividing cells in the microscope and reasoned that cells come from other cells Rudolph Virchow Virchow: http://www.parlament-berlin.de/Galeriecopy.nsf/0/8ABC720262898739C1256A480037F869?OpenDocument Mitosis: http://biology.dbs.umt.edu/biol101/labs/lab_6_images/sect01and06/Rebecca,%20tanner,%20and%20liam%20mitosis%20root%20tip.jpg

CELL THEORY 1. All living things are ________________________. MADE OF CELLS 2. Cells are the basic unit of ____________ & _____________ in an organism. (cell = basic unit of _____________) STRUCTURE FUNCTION life 3. Cells come from the reproduction of ____________ cells existing Cell image: http://waynesword.palomar.edu/lmexer1a.htm

Cells are diverse! Chaos chaos- a giant amoeba next to a paramecium Both are unicellular (one-celled) organisms Right- Chaos “eating” a paramecium… http://www.microscope-microscope.org/applications/pond-critters/protozoans/sarcodina/chaos-chaos.htm

But all cells share these characteristics… All cells are surrounded by a thin flexible barrier called the cell membrane. All cells (at some point in their lives) contain DNA.

CELL SIZE http://facstaff.bloomu.edu/gdavis/links%20100.htm Typical cells range from: 5 – 50 micrometers (microns) in diameter