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The Discovery of Cells.

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Presentation on theme: "The Discovery of Cells."— Presentation transcript:

1 The Discovery of Cells

2 Partner time On your paper, write 1, 2, and 3
Find a different partner for each of those times. Your first and last partners can not be someone with whom you currently sit.

3 What does this look like to you?

4 Robert Hooke 1665 Used a microscope to look at cork (a plant tissue)
He thought cork looked like little boxes Named the boxes “cells” which means little rooms in Latin

5 What Hooke’s microscope looked like

6 More about Hooke Scarred from childhood smallpox
First to examine fossils with a microscope Used a telescope to describe Jupiter’s Great Red Spot and rotation of Mars

7 What else did Hooke see? Looked at plants, fungi, fish scales, feathers and eyes of flies Thought cells only found in plants

8

9 Anton von Leeuwenhoek Saw first live cells
He named creatures he saw in pond scum “animalcules”

10 Anton von Leeuwenhoek Looked at blood cells from different animals
Looked a tartar from teeth First to see bacteria Discovered yeasts are living organisms

11 Partner time Find your number 2 partner
Discuss how the work of Hooke and Leeuwenhoek helped in the discovery of cells

12 Matthias Schleiden Studied lots of plant tissues –all of which contained cells Concluded all plants are made of cells

13 Theodore Schwann Studied lots of animal tissues –all of which contained cells Concluded all animals are made of cells

14 Theodore Schwann Wrote the first two parts of the cell theory
1. All living organisms are composed of one or more cells 2. The cell is the basic unit of life in all living things

15 Rudolf Virchow A pathologist All cells come from pre-existing cells

16 Cell Theory 1. All living organisms are composed of one or more cells
2. The cell is the basic unit of life in all living things 3. All cells come from existing cells

17 Partner Time Find your number 3 partner
Together, write down the three parts of the cell theory and the scientist who lead to each part

18 Things cells have in common
Cell membrane: acts as a barrier between inside of cell and cell’s environment Hereditary material: DNA Small Size

19 Things cells have in common
Cytoplasm: fluid inside the cell Organelles: structures inside the cell Only some cells have membrane bound organelles

20 Two types of cells Eukaryotic Prokaryotic

21 Two types of cells Eukaryotic Prokaryotic
DNA in a membrane bound nucleus Cell membrane Cytoplasm Prokaryotic DNA not in a membrane bound nucleus Cell membrane Cytoplasm

22 Two types of cells Prokaryotic Eukaryotic Cell Wall
Some have cell walls Contains membrane bound organelles Have ribosomes Can be unicellular or multicellular Prokaryotic Cell Wall No membrane bound organelles Have ribosomes Unicellular

23 Two types of cells Eukaryotic Prokaryotic
About 10 times larger than bacteria Reproduce by mitosis Linear DNA All other cells Prokaryotic Very small Reproduce by binary fission Circular DNA Bacteria: Staphlococcus aureus

24 Two types of cells Eukaryotic Prokaryotic

25 Partner time Find your number 1 partner and go sit with them. Together, prepare a venn diagram of prokaryotic vs eukaryotic cells.

26 Review Fill out the prokaryotic vs. eukaryotic chart

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