1. Unit 3: A View of the Cell
Chapter 3

2. Bellwork 10/24 If you were absent yesterday come see me
List the three statements that compose the Cell Theory.
______________________________________________
2. In science, a theory is an explanation for some phenomenon that is based on observation, experimentation, and reasoning. One important theory in biology is the cell theory. What kinds of observations led to the development of the cell theory?
testing of first vaccines
discoveries of fossil bacteria
isolations of DNA and RNA
microscopic views of plants and animals
3. A cheetah, like those shown below at left, and a paramecium, like the one shown below at right, are both living things. According to the cell theory, what can you conclude about these two very different organisms?
A. They are made of many cells.
B. They are made of one or more cells.
C. They come from the same kind of cell.
D. They come from noncellular structures.
Bellwork 10/24
If you were absent yesterday come see me
Turn in the syllabus, cell theory notes and poster
Take out some paper and complete the review on it.

3. What is the cell theory and how was it discovered?
Essential Question
Learning Goal
What is the cell theory and how was it discovered?
Explain what the 3 parts of the cell theory are and describe what events and scientists led to the discovery of the cell theory.

4. 3 parts of the cell theory:
1. All living things are composed (made) of cells.
2. Cells come from preexisting cells (cells reproduce other cells)
3. Cells are the basic, simplest unit of living things.

5. Scientists
How they contributed
Hooke
Looked at cork under microscope and named what he saw cells
Leeuwenhoek
First person to view a living organism
Schleiden
Studied plants and realized they were made of cells Hooke saw
Schwann
Studied animals and realized they too were made of cells
****Virchow
***Realized all cells come from preexisting cells NOT through spontaneous generation

6. The invention of the compound light microscope helped to prove the cell theory as it disproved that life happens from spontaneous (random) generation. In other words, people believed that a living thing could be created from a non-living thing and the microscope proved that to be an incorrect belief.

7. How are prokaryotic cells similar and different than eukaryotic cells?
Prokaryotes
Both
Eukaryotes
Include Bacteria
Smaller in size
Do NOT have a nucleus or membrane bound organelles
Contain DNA
Unicellular – one cell
Contains cytoplasm
Contains ribosomes
Contains cell membrane
Includes plants, animals, fungi, protists
Larger in size
Have nucleus and membrane bound organelles
Complex cells

8. What is the difference between plant and animal cells?
Both
Plant Cells
Circular/Rounded Shape
Lysosomes
Centrioles
Eukaryotic
Multicellular
Contain nucleus, Cytoplasm, Cell (Plasma membrane), Rough and Smooth Endoplasmic Reticulum, Mitochondria, Golgi Body
Square shaped
Contain Cell Wall
Contain Chloroplasts
Contain Large Vacuole

9. ** Know structures based on looking at a diagram