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

2. 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: Cork image:
Hooke image:

3. 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: Animation from:

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 __________________________concluded that
ALL PLANTS
are made of cells
Matthias Schleiden
Plant image: Schleiden image:

6. Theodor Schwann 1839- German zoologist
_________________________concluded that
Theodor Schwann
ALL ANIMALS ARE MADE OF CELLS
Schwann image:
Animals image:

7. Rudolph Virchow 1855- German medical doctor _____________________
saw dividing cells
in the microscope
and reasoned that
cells come from
other cells
Rudolph Virchow
Virchow:
Mitosis:

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:

9. Cells are diverse! Chaos chaos- a giant amoeba next to a paramecium
Both are unicellular (one-celled) organisms
Right- Chaos “eating” a paramecium…

10. 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.

11. CELL SIZE
Typical cells range from: 5 – 50 micrometers (microns) in diameter