What am I?
Hint: You may find me flying in your garden.
Monarch Butterfly
What am I?
Hint: You may eat me as a nice juicy treat.
Orange
What am I?
Hint: I have a cartoon relative named Bob.
Sponge
What am I?
Hint: I love to curl up and sleep in the sun.
House Cat
What am I?
Hint: You might cry when you cut me into slices.
Onion
What do all of these living
organisms have in common?
ALL living organisms are made up
of cells!!!
When you approach a building
from a distance, you first notice
the shape of the whole building.
As you draw nearer to the building,
you become aware of its different
parts: walls, windows, doors,
staircases, downspouts, and so forth.
When you are only a few feet away,
you realize that the walls are made
up of bricks. Each brick forms part
of the structure of the entire building
If you were to look at one of those
bricks up close you would see
its structure.
Animals and plants have an overall
shape or structure, as well as
different components parts.
But when you examine their structure
more closely, you see that they
are made up of smaller units.
These tiny “bricks” that make up
the structure of living things are
called cells. Cells are too small
to be seen with the naked eye, but
are clearly visible under a microscope
CELL THEORY
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All living organisms are made up of cells.
Cells are the basic unit of structure and
function in an organism.
All cells arise from other cells.
Cell Theory
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What is a theory? A theory is an explanation
of a set of observations or events based upon
proven hypotheses and verified multiple times
by different people.
So if we were to apply this to cells, we would
expect that any living organism we looked at
under the microscope would be composed of
one or more cells!
Cell Theory
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What do we mean by structure and
function in the second part of the theory?
Cells are the basic unit of structure and function in an
organism.
Structure is what we see when we look at
something – a buildings structures are the walls,
windows, doors, etc.
Function is the purpose for which something
exists. A cells function is to survive!
Cell Theory

All cells arise from other cells means that
cells do not appear from no where, but
come from other cells.
Cells can be classified into 2 groups.
Eukaryotic Cells
Have a defined nucleus.
Found in organisms that are made
up of many cells.
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Animals
Plants
Prokaryotic Cells
Animal Cell
Plant Cell
Let’s look at some actual
plant and animal cells!
Plant Cells
Animal Cells
Cells can be classified into 2 groups.
Eukaryotic Cells
Prokaryotic Cells
No structured nucleus
Exist as single-celled organisms
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Bacteria
Prokaryotic Cell
How would you classify this cell?
How about this cell?
What about this one???
This one?
Which is Which???
Prokaryotic cell –Eukaryotic cell
Get ready
to test
your
Cell IQ!!!
Question 1:
All living organisms are made up of
cells.
A. True
B. False
Question 1:
All living organisms are made up of
cells.
A. True
Question 2:
According to the Cell Theory…
A. All cells have cell walls.
B. All cells arise from other cells.
C. All cells have a nucleus.
Question 2:
According to the Cell Theory…
B. All cells arise from other cells.
Question 3:
You can see most cells without a
microscope.
A. True
B. False
Question 3:
You can see most cells without a
microscope.
B. False
Question 4:
What type of cell has a nucleus?
A. Prokaryotic cell
B. Eukaryotic cell
C. None of the above
Question 4:
What type of cell has a nucleus?
B. Eukaryotic cell
CELLS
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All living organisms are made up of cells.
Cells are the basic unit of structure and
function in an organism.
All cells arise from other cells.
Microscopes are important scientific tools.
Cells Cells Cells!!!