Download 1. Cell Theory PPT - Lyndhurst Schools

CHAPTER 5:
CELL STRUCTURE & FUNCTION
UNIT 4 CELLS: THE BASIC THEORY OF LIFE
SECTION 5-1: THE CELL THEORY
•  Discuss in detail the discovery of the “cell” by
Robert Hooke.
•  Discuss the contributions of other scientists
leading to the development of the cell theory.
•  State the cell theory.
•  Vocabulary: cell, cell theory
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CELL THEORY
•  development & refinement of
magnifying lenses & light
microscopes made observation &
description of microscopic
organisms & living cells possible
•  many scientists contributed
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TIMELINE OF THE
CELL THEORY
•  lenses used 100s of years ago as magnifiers
•  1632: Anton van Leeuwenhoek
•  credit for developing 1st microscope
•  observed pond water & made detailed drawings of each kind of
tiny organism living in it (1st to see bacteria & protists)
•  1665: Robert Hooke
•  used microscope to look at thin slices of plant stems, wood, &
pieces of cork  coined term “cell”
•  1833: Robert Brown
•  noted dark structure near center of cell (nucleus)
•  1838: Matthias Jakob Schleiden – all plants made of cells
•  1839: Theodor Schwann – all animals made of cells too
•  1855: Rudolf Virchow – cells arise from division of preexisting cells
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CELL THEORY
•  The cell theory states
•  All living things are composed of cells.
•  Cells are the basic units of structure & function
in living things. (The cell is the basic unit of life)
•  All cells come from pre-existing cells.
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VISUALIZING CELL SIZE
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CELL THEORY REVIEW QUESTIONS
•  What contributions did van Leeuwenhoek,
Hooke, Schleiden, Schwann, & Virchow make in
the development of the cell theory?
•  What role did the invention of the microscope
play in the development of the cell theory?
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