Prokaryotic Cell
Key Terms
1. Cells
2. Microscope
3. Cell Theory
Leaf under a
microscope
Microscope
Infected red blood
cells
Frog Blood
Human Blood
An Overview of Cells
Cell- Basic units of life.
Cells and Structure
•The structure of living things are
determined by the amazing variety in
which cells are put together.
(LEGOS)
Cells and Function
•An organisms function are the
process that enable it to stay alive
and reproduce.
Many and Small
•One square centimeter of your
skins surface contains more than
100,000 cells.
Development of Cell Theory
Cell Theory states the
following:
•All living things are composed
of cells.
•Cells are the basic units of
structure and function in all
living things.
•All cells are produced from
other cells.
Cell Theory
First Observation of Cells
Vocabulary:
Microscope-An instrument that makes small objects look larger.
Blood under a
microscope
•
The invention of the microscope made it possible
for people to discover and learn about cells.
Microscopes
Robert Hooke
Anton van Leeuwenhoek
• Robert Hooke was an English
scientist who was one of the
first to observe cells.
• In 1663, Hooke invented a
microscope of his own, to
observe the structure of a thin
slice of cork.
• Leeuwenhoek also began to
observe tiny objects with
microscopes at the same time
as Robert Hooke.
• Leeuwenhoek looked at drops
of lake water, and scraping of
teeth and gums, and water
from rain gutters.
1663 microscope
http://www.youtube.com/watch?v=XgW1Hi
V9SJs&feature=player_detailpage#t=3
Hooke’s drawings of cork cells.
Plant cells under a microscope
Tech and Design in History
1590 first compound
microscope
• Dutch eyeglass makers
Zacharias and Hans
Janssen made one of the
first compound
microscopes.
First compound
microscope
1981 scanning
Tunneling Microscope
• An STM measures electrons
that leak, or “tunnel,” from the
surface of a specimen. STM’s
can magnify a specimen up to
1 million times.
Scanning
Tunneling
Microscope
Section 3 Assessment
1.a. Define function and structure.
1.b. Explain: Cells are the basic units of structure and function in
organisms.
1.c. In what important function are the cells in your eyes involved?
2.a. What does a microscope enables people to do?
2.b. Summarize Hooke’s observation of cork under a microscope.
2.c. Why would Hooke’s discovery have been impossible without a
microscope?
3.a. What are the main ideas of the cell theory?
3.b. What did Virchow contribute to the cell theory?
3.c. Use the ideas of Virchow to explain why plastic plants and stuffed
animals are not alive.
4.a.What is magnification?
4.b.Contrast the way light microscopes and electron microscopes
magnify objects.