cell theory. play video play video stop at 1:10
TRANSCRIPT
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Cell Theory
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How do you define life?
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Do you like the video’s definition of life? Is the
definition wrong in anyway?
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Objectives• You will be put in groups of 2 - 4 and will be assigned a station.• You will have 3 minutes at each station and I will tell you when you can move to the next station.•You MUST move quickly and use your time wisely. You will NOT have more time tomorrow.• You must draw what you see in the microscope on your worksheet
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• DO NOT PUSH THOSE THAT ARE LOOKING INTO THE MICROSCOPE
• DO NOT ADJUST THE MICROSCOPE, BECAUSE YOU WILL LOSE THE IMAGE
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Did you find any patterns between the
slides?
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What criteria makes an organism to be considered “living”?
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Based on this investigation, what are living things made of?
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What did you notice about the non-living slides?
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Which group do you think are living cells; the ones labeled 1, 2, or 3?
Why?
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Which group is non-living? Why?
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Which group are dividing?
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What can you conclude when comparing non-living material
to living material?
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Living things are different fromnon living things…
All living things:•are made up of cells (organization)•respond to the environment•have the ability to reproduce•move•grow and develop•perform metabolic processes
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What did you observe today that tells you not all cells are exactly alike? Do
they have anything in common?
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What you were looking at?
_ 1A- oral smear_ 1B- cork_ 1C- liver_ 1D- onion_ 1E- Leaf_ 2A- onion mitosis_ 2B- fish mitosis_ 2C- worm mitosis_ 3A- hand sanitizer_3B- paper cutout of letter A
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Based on the investigation what can you conclude after looking at the
animal and plant cells (Station 1) ?
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Are there different types of cells? How do you know? What are some examples?
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What do all cells have in common?
How are they different?
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What if an organism is one-celled? How does it function? Is it considered
alive too?
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All living things are made up ofcells….
•The cell is the smallest unit of a living thing
•If an organism is unicellular, all functions of life happen within that one cell
•If an organism is multicellular, different cells have different jobs and they all work together
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Where do cells come from?
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We just came up with the 3 components of the cell theory.
Can anyone repeat them?
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CellTheory
•all living things are made of one or more cells•the cell is the smallest unit of life•all new cells come from preexisting cells
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Have we ever found any evidence to disprove this theory? What
about Data from Star Trek
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What tool helped scientists come up the
cell theory?
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Do you think this might get more complex and difficult to answer as we develop more technology that can do things?
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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 describedmicroorganisms in pond water
• He looked at pond water under the microscope (300x)• He noticed that the water was full of moving living things
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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
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Continued
20 years later Rudolf Virchow concluded that all living cells arise from preexisting cells
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Blast from the past
Why is the cell theory a theory?
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Cell Theory Rap/Song
You will be grouped in four groups of five
You must come up with a 2 minute rap/song to help you remember what the cell theory is. You must include the three components of the cell theory in your rap/song.
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Jump for JoyIt’s Assessment
time