1. Cell Theory

2. How do you define life?
Play Video
Stop at 1:10
Engagement continued

3. Do you like the video’s definition of life
Do you like the video’s definition of life? Is the definition wrong in anyway?
Engagement continued
_Summarize the videos definition that was given about life.
_Does the video highlight a controversy about what is life?
_ Do you think there was a controversy earlier in science about what life was?
_ How did technology provide us a different way of looking at how organisms were made?

4. Which group(s) do you think are living cells? Group 1? Group 2? Group 3? Are more than one group living? Group 1 = slides 1 – 5 Group 2 = slides 6 – 8 Group 3 = slides 9 and 10 Why?

5. What criteria makes an organism to be considered “living”?

6. Based on this investigation, what are living things made of?

7. Did you find any other patterns between the slides?
Explanation

8. Which group is non-living? Why?

9. What did you notice about the non-living slides?

10. Which group are dividing?

11. What can you conclude when comparing non-living material to living material?

12. What you were looking at?
_ 1A- paramecium
_ 1B- cork (from a tree)
_ 1C- amphibian liver
_ 1D- fern
_ 1E- leaf
_ 2A- onion mitosis (mitosis is cell reproduction or duplication)
_ 2B- fish mitosis
_ 2C- sunflower pollen (pollen is the male sex cell in plants)
_ 3A- colored thread
_3B- paper cutout of letter e

13. Living things are different from non living things…here are the 6 characteristics of living things
All living things:
are made up of cell(s)
perform metabolic processes/contain similar chemicals
use energy
grow and develop
have the ability to reproduce
respond to their environment (either internally or externally)

14. Are there different types of cells. How do you know
Are there different types of cells? How do you know? What are some examples?

15. What do all cells have in common? How are they different?

16. All living things are made up of cells….
The cell is the smallest unit of a living thing
If an organism is unicellular, all functions of life happen within that one cell by the organelles.
If an organism is multicellular, different cells have different jobs and they all work together.

17. Where do cells come from?

18. We just came up with the 3 components of the cell theory
We just came up with the 3 components of the cell theory. Can anyone repeat them?

19. Cell Theory All living things are made of one or more cells.
The cell is the smallest (basic) unit of life.
All new cells come from preexisting cells.

20. What tool helped scientists come up the cell theory?

21. A little history 1660’s – Robert Hooke discovered the cell.
He looked at cork under the microscope (30x)
He noticed little compartments, which he named after
the little rooms that monks lived in…”Cells”
1670’s – Anton von Leeuwenhoek described
microorganisms in pond water.
He looked at pond water under the microscope (300x).
He noticed that the water was full of moving living things.

22. How did the cell theory come to be?
M.J. Schleiden Theodor Schwann
They discovered that the cell was the basic unit of life and that all living things are composed of cells

23. Continued
20 years later Rudolf Virchow concluded that all living cells come from preexisting cells.