Cell Scientists, Cell Size, and Cell Specialization Chap 7-1

1
Cell Scientists, Cell Size, and Cell
Specialization Chap 7-1
http//www.parlament-berlin.de/Galeriecopy.nsf/0/8
ABC720262898739C1256A480037F869?OpenDocumen http/
/www.ncu.edu.tw/ls/graph/faculty_pictures/whole_t
ime/SLC/SLC_lab-1.jpg t
2
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/mic
roscopeCork image http//www.cortex.de/img_kork/
cork_cells_big.jpg Hooke image
http//www.metaweb.com/wiki/upload/5/5c/Hookeyoung
mtwb.jpg
3
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.c
om/topic/microscopeAnimation from
http//web.jjay.cuny.edu/acarpi/NSC/13-cells.htm
4
Soon after Van Leeuwenhoek

• Observations made it clear that CELLS were the
  basic units of life.
• Unicellular- one-celled
• Multicellular- many-celled

5
1838-German botanist __________________________c
oncluded that ALL PLANTS are made of cells
Matthias Schleiden
Plant image http//www.epa.gov/maia/images/classi
fication.gifSchleiden image http//web.visionlea
rning.com/events/Schleiden_Apr5_2005.htm
6
1839-German zoologist _________________________co
ncluded that
Theodor Schwann
ALL ANIMALS ARE MADE OF CELLS

• Schwann image http//home.tiscalinet.ch/biografie
  n/biografien/schwann.htm
• Animals image http//animaldiversity.ummz.umich.
  edu/index.htm

7
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/Galeriecop
y.nsf/0/8ABC720262898739C1256A480037F869?OpenDocum
ent Mitosis http//biology.dbs.umt.edu/biol101/l
abs/lab_6_images/sect01and06/Rebecca,20tanner,20
and20liam20mitosis20root20tip.jpg
8
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
9
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
10
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.

11
CELL SIZE
http//facstaff.bloomu.edu/gdavis/links20100.htm

• Typical cells range from 5 50 micrometers
  (microns) in diameter