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The Cell Theory - PowerPoint PPT Presentation


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The Cell Theory. Hairy T-cell. What is it?. Accepted explanation of the relationship between cells and living things, 3 Part Theory. Part 1 of the Theory 1. All living things are made of cells. Part 2 of the Theory. 2. The cell is the basic structural and functional unit of life.

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The Cell Theory

Hairy T-cell

what is it
What is it?

Accepted explanation of the relationship between cells and living things, 3 Part Theory.

Part 1 of the Theory

1.All living things are made of cells.

part 2 of the theory
Part 2 of the Theory

2. The cell is the basic structural and functional unit of life.

part 3 of the theory
Part 3 of the Theory

3. All cells come from pre-existing cells.

yeast cells dividing

how were they able to come up with this theory
How were they able to come up with this theory?

Hooke (circa 1663)

I made the first microscope and observe small spaces and called them cells!

I had no idea how important this would be later.

who came up with this theory
Who came up with this theory?

1. Schleiden (circa 1838)

All plants are made of cells!

Onion skin cells

who came up with this theory1
Who came up with this theory?

2. Schwann

All animals are made of cells!

Human red blood cells

who came up with this theory2
Who came up with this theory?

3. Virchow

All cells come from pre-existing cells!

how can we study cells
How can we study cells?

Problem:

They are microscopic!

Solution:

Use a microscope! DUH!

types of microscopes
Types of Microscopes

Compound Light Microscope

  • Light passes through lenses to magnify image up to 1000X
  • Can observe living cells
types of microscopes1
Types of Microscopes

Electron microscope

  • Uses a beam of electrons to magnify image

> 1000X

  • Kills cells being observed