1. A View of the Cell
Life is Cellular

2. Discovering the Cell Robert Hooke used a microscope to study cork
coined the
term “cell”
Before microscopes were invented, people believed that diseases were caused by curses and supernatural spirits.
Invention of the microscope - scientists realized they were entering a new world – one of microorganisms.
Microscopes enabled scientists to view and study cells, the basic units of living organisms.
Hooke – cork- thousands of tiny,empty chambers (monastery’s chambers called cells) Cells are not empty!
Around the same time, Van Leuenhoek – tiny living organisms everywhere, even in the water he drank!
Schleiden concluded that all plants are made up of cells
Schwann concluded that all animals are made of cells.
Lead to the cell theory. . .
Anton van Leeuwenhoek
first person to discovered life in water using a microscope

3. I. Introduction to the Cell
A. Cell Theory
All organisms are made up
of one or more cells.
Cells are the basic unit of
structure & function in organisms.
All cells come from preexisting cells.
All living things are composed of cells.
Cells are the basic unit of structure & function in living things.
New cells are produced from existing cells.

4. B. Cells differ in size, shape, & organization.
Cell Size
Small cells function more efficiently than large cells. Smaller is BETTER!
Large cells cannot function efficiently in the transport of materials & waste into and out of the cell.

5. B. Cells differ in size, shape, & organization.
Cell Shape
The shape of cell depends on its function.

6. C. Internal Organization
Most cells contain a variety of membrane bound ORGANELLES - cell parts that perform specific functions for the cell
Organelles – little organs

7. A Large Organelle near the center of the cell is the NUCLEUS
A Large Organelle near the center of the cell is the NUCLEUS.  It contains the cell’s genetic information and controls the activities of the cell.
Whether a cell has or does not have a NUCLEUS is important for classifying cells.

8. II. Prokaryotes Vs. Eukaryotes
ORGANISMS WHOSE CELL OR CELLS CONTAIN A NUCLEUS AND OTHER MEMBRANE-BOUND ORGANELLES.
MORE COMPLEX
CAN BE HIGHLY SPECIALIZED
UNICELLULAR OR MULTICELLULAR
PLANTS, ANIMALS, FUNGI, PROTISTS

9. Prokaryotes Vs. Eukaryotes
ORGANISMS WHOSE CELLS DO NOT HAVE A NUCLEUS AND OTHER MEMBRANE-BOUND ORGANELLES.
SMALLER AND SIMPLER
UNICELLULAR ORGANISMS SUCH AS BACTERIA AND BLUE-GREEN ALGAE

10. The difference between Prokaryotes and Eukaryotes is such an important distinction that they are placed in separate Kingdoms.

11. Cell Structure (concept map)
can be
prokaryotic
eukaryotic
which are found in
animals
which are known as
which lack
which contain
plants
protists
fungi
bacteria
organelles

12. WRAP-UP QUESTIONS What is the smallest most basic unit of life?
Where is DNA in eukaryotes? …prokaryotes?
Why would you need a microscope to see a prokaryotic organism?
What are the 3 parts of the cell theory?
Where do viruses fit in the cell theory?

13. Virology - study of viruses
tiny, much smaller than a cell and only visible with advanced electron microscopes;

14. Viral Characteristics
Non living
Not made up of cells
Cannot grow or replicate on their own
Must be reproduced in living cells