Cell Theory
How do you define life? Play Video Stop at 1:10 Engagement continued
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?
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?
What criteria makes an organism to be considered “living”?
Based on this investigation, what are living things made of?
Did you find any other patterns between the slides? Explanation
Which group is non-living? Why?
What did you notice about the non-living slides?
Which group are dividing?
What can you conclude when comparing non-living material to living material?
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
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)
Are there different types of cells. How do you know Are there different types of cells? How do you know? What are some examples?
What do all cells have in common? How are they different?
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.
Where do cells come from?
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?
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.
What tool helped scientists come up the cell theory?
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.
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
Continued 20 years later Rudolf Virchow concluded that all living cells come from preexisting cells.