Cell Scientists Cell Size and Cell Specialization Chap

Cell Scientists, Cell Size, and Cell Specialization Chap 7 -1 http: //www. parlament-berlin. de/Galeriecopy. nsf/0/8 ABC 720262898739 C 1256 A 480037 F 869? Open. Documen http: //www. ncu. edu. tw/~ls/graph/faculty_pictures/whole_time/SLC_lab-1. jpg

1665 Robert Hooke ___________ used a microscope to examine a thin slice of cork, a plant material, and saw “little boxes. ” 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/5/5 c/Hookeyoungmtwb. jpg

1673 Anton van Leeuwenhoek __________________ a Dutch microscope maker was the first to see LIVING UNICELLULAR ORGANISMS in pond water. 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 Matthias Schleiden _____________ concluded that ALL PLANTS are made of cells Plant image: http: //www. epa. gov/maia/images/classification. gif Schleiden image: http: //web. visionlearning. com/events/Schleiden_Apr 5_2005. htm

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

1855 German medical doctor Rudolph Virchow ___________ saw dividing cells in the microscope and reasoned that cells come from other cells Virchow: http: //www. parlament-berlin. de/Galeriecopy. nsf/0/8 ABC 720262898739 C 1256 A 480037 F 869? Open. Document Mitosis: http: //biology. dbs. umt. edu/biol 101/labs/lab_6_images/sect 01 and 06/Rebecca, %20 tanner, %20 and%20 liam%20 mitosis%20 root%20 tip. jpg

CELL THEORY 1. All living things are ____________. MADE OF CELLS 2. Cells are the basic unit of STRUCTURE & _______ FUNCTION ______ in an organism. life (cell = basic unit of _______) 3. Cells come from the reproduction of ______ cells existing Cell image: http: //waynesword. palomar. edu/lmexer 1 a. 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… 1. All cells are surrounded by a thin flexible barrier called the cell membrane. 2. 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