1. KEY CONCEPT Cells are the Basic unit of life.
Macrophages- play an important role in your immune system- take in a digest foreign materials (red= bacteria)

2. The cell theory grew out of the work of many scientists and improvements in the microscope.
Many scientists contributed to the cell theory.
Concluded that ALL living things are made of cells
Proposed that all cells come from other cells
First to identify cells and named them
Made better lenses for microscopes
First to note that plants are made of cells

3. Robert Hooke
In 1665 he used the three-lens compound microscope to examine thin slices of cork
He observed that cork is made of tiny, hallow compartments
These compartments reminded Hooke of small rooms
found in monasteries (where monks live), so he
named them cells.

4. More was learned about cells as microscopes improved.

5. Cells
Red blood cells
cork

6. How does the size of a cell in a blue whale compare to the size of the cell in a tadpole?

7. How does the size of a cell in a blue whale compare to the size of the cell in a tadpole?
A: Most cells in a whale are the same size as in a tadpole! So what makes a blue whale so much bigger?
A whale has far more cells.

8. The Cell theory has three principles.
1. All organisms are made of cells.

9. 2. All existing cells are produced by other living cells.

10. 3. The cell is the most basic unit of life.

11. One of the 3 principles of cell theory is that ALL existing cells are produced by other existing cells. Apply this principle to a cut on your arm.
(Explain what is happening throughout the healing process)

12. Messages are sent to skin cells to replicate
Answer
One of the 3 principles of cell theory is that ALL existing cells are produced by other existing cells. Apply this principle to a cut on your arm.
You get a cut
You start to bleed
You form a scab
Messages are sent to skin cells to replicate
Skin cells replicate through mitosis
New skin cells are created
Scab falls off
You are healed!

13. All cells share certain characteristics Cells tend to be microscopic.
All cells are enclosed by a membrane.
All cells are filled with cytoplasm.
cell membrane
Bacterium
(colored SEM; magnification 8800x)
cytoplasm

14. Draw and label picture on top of p. 24
There are two cell types: eukaryotic cells and prokaryotic cells.
Eukaryotic cells have a nucleus.
The nucleus holds the
DNA
Have membrane-bound
organelles
May be multi-cellular
or single-celled
organisms
nucleus
organelles
cell membrane
Draw and label picture on top of p. 24

15. Organelles: structures that are specialized to perform distinct processes within a cell. The nucleus is usually the largest and most visible organelle.

16. Things that have Eukaryotic Cells:
PLANTS
ANIMALS
FUNGI

17. Cytoplasm: is a jellylike substance that contains dissolved molecular building blocks- such as proteins, nucleic acids, minerals, and ions
Bacterium
(colored SEM; magnification 8800x)

18. Draw and label picture on top of p. 24
Prokaryotic cells do not have a nucleus.
do not have membrane-bound organelles
DNA is in the cytoplasm
All are microscopic, single-celled organisms
cell membrane
cytoplasm
Draw and label picture on top of p. 24

19. Things that have prokaryotic cells
Archaea
Bacteria

20. Viruses
Virus- An infective agent that typically consists of a DNA or RNA strand in a protein coat.
multiply only within the living cells of a host
Antibiotics will not work on them
Vaccines prevent them
Protein Coat
EX: Herpes virus
Influenza
Chickenpox
Ebola virus