the discovery of cells in 1665 robert hooke looked at cork under the microscope and described what...
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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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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.
• 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
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
All cells have:
2. Hereditary material- DNA
• A nucleic acid, such as DNA, contains the genetic information for a cell.
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
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