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Exploring the Cell
What is a cell?
A cell is the basic unit of life
Cell Theory:
The development and enhancement of _____Microscopes________ made the observation and
description of ____microscopic_______ ____organisms__________ and ____living______
___cells_____ possible.
Three parts to the cell theory:
1. The cell is the basic unit of life
2. All living things are made of cells
3. Cells come from pre-existing cells
Famous Individuals who helped in the advancement of the cell theory:
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Robert Hooke: (1665) - Looked at cork under the microscope and saw tiny empty chambers
that he called cells
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Anton Van Leeuwenheok: (1674) - Improved the microscope, and was the first to see single
celled organisms
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Matthais Schleiden: (1838) – All plants are made of cells
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Theodor Schwann: (1839) – All animals are made up of cells
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Rudolph Virchow: (1855) – Proposed that all cells come from existing cells, completing the
cell theory
Two types of cells:
- Prokaryote
- Eukaryote
Prokaryotic:
-
___Simplest_______ life form
All are _____unicellular____________
Two major forms _______eubacteria___________ and ____archaebacteria_______
Prokaryotes are cells that lack _____a nucleus________ and ______membrane________
_____bound_________ _____organelles______
Eukaryotes:
-
Arose from ____prokaryotes_________ and developed into larger more complex organisms
Eukaryotes are cells that contain a ______nucleus_______ and ____organelles__________
surrounded by a membrane
Eukaryotic cells:
-
Can be _______unicellular_______ or _____multicellular____________
Contain a nucleus in which their ____genetic_______ _____material_________ is separated
from the rest of the cell.
Examples: plants, animals, fungi, and protists