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The Discovery of Cells

In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

Cell theory includes three principles.

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Page 4: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

Concept #1- A polarbear is made up ofmany cells!

Concept #3- All polar bearscell came from a single livingcell. They divide and theygrow to replace old dead cells!

Concept #2- Different cells ina polar bears body doesdifferent jobs (functions). Example: Fatcells provide insulation andenergy, while red blood cellscarry oxygen.

Page 5: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

• The main ingredient in any cell is water. A water molecule has two areas:

• The negative (–) end can attract the positive part of another substance.

• The positive (+) end can attract the negative part of another substance.

Basic Cell Substances

Page 6: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

All cells have:

1. Cell membrane– a flexible covering that protects the inside of a cell– controls movement of materials in & out of the cell

http://www.google.com/url?sa=i&rct=j&q=cell%20membrane&source=images&cd=&cad=rja&docid=HP7zUsS6m6KxtM&tbnid=bLE0qipV_5eM2M:&ved=0CAUQjRw&url=http%3A%2F%2Fpeople.eku.edu%2Fritchisong%2FRITCHISO%2F301notes1.htm&ei=-0VdUteRGZSK9QS48AE&psig=AFQjCNE_fYDoZ1SNhRyF7eckfZLZAxj9gQ&ust=1381930858292969

Page 7: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

All cells have:

2. Hereditary material- DNA

• A nucleic acid, such as DNA, contains the genetic information for a cell.

Page 8: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

All cells have:

3. Cytoplasm- Clear, thick, gel-like fluid that contains most of the cell’s water, salts, other molecules, and all organelles*It is constantly moving

Page 9: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

All cells have:

4. Organelles- • tiny membrane-

surrounded structures inside the cell that carry out specific functions.– They enable the cell to

live, grow, and reproduce

Page 10: The Discovery of Cells In 1665 Robert Hooke looked at cork under the microscope and described what he saw as “tiny rooms” or “cells”

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