CONTRIBUTIONS TO THE CELL THEORY Timeline of scientists and their discoveries.
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Transcript of CONTRIBUTIONS TO THE CELL THEORY Timeline of scientists and their discoveries.
![Page 1: CONTRIBUTIONS TO THE CELL THEORY Timeline of scientists and their discoveries.](https://reader035.fdocuments.us/reader035/viewer/2022062408/56649f095503460f94c1dc26/html5/thumbnails/1.jpg)
CONTRIBUTIONS TO THE CELL THEORY
Timeline of scientists and their discoveries
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1) Anton von Leeuwenhoek
1600’sDutch businessmanInvented 1st simple light microscope
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Anton von Leeuwenhoek (con’t)
Observed tiny organisms in pond waterOrganisms were nicknamed “wee beasties”
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2) ROBERT HOOKE
1665English physicistObserved flowers, insects, and plant tissue
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ROBERT HOOKE (con’t)
Observed thin slices of cork (oak tree)Coined the term “cell” based on the rooms in a monastary
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3) ROBERT BROWN
1833Observed plant cells under the microscope
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ROBERT BROWN (con’t)
Observed a dark structure inside each cell and coined the term “nucleus”
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4) MATTHIAS SCHLEIDEN
1838German botanist: scientist who studies plantsConcluded all plants are made up of cells
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5) THEODORE SCHWANN
1839German biologistConcluded all animals are made of cells
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6) RUDOLF VIRCHOW1855German PhysicianStudied cell reproductionConcluded all cells arise from preexisting cells
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The cell theory
1. All living things are composed of cells2. Cells are the basic unit of structure and function in living things.3. All cells arise from preexisting cells.
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Introduction to Cells
Chapter 6
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Levels of OrganizationAll living organisms can be studied on many levels
From smallest to largest they are:Chemical (atoms & molecules)
Cells
Tissues
Organs
Organ Systems
Whole Organism
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Basic Structure of Cells
All cells have a cell membrane and cytoplasmCell Membrane: thin, flexible barrier around cell
Composed of lipids and proteins
Cytoplasm: jelly-like material inside the cell
All cells contain organellesOrganelles: small structures that perform different functions within a cell
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Prokaryotic Cells
Do NOT have a nucleusInstead a small ring of DNA is free-floating in center of cell
Organelles do NOT have a membrane
i.e.: bacteria (very simple organisms)
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Eukaryotic Cells
Contain a nucleus
Organelles are membrane-bound
Much more complex
i.e.: plants, animals, fungi
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