Chapter 7.1~ Life is Cellular Pages 169-172. Important “Cellular” Scientists Robert Hooke- 1665 Constructed one of the first light microscopes Looked.

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Chapter 7.1~ Life is Cellular Pages

Important “Cellular” Scientists Robert Hooke Constructed one of the first light microscopes Looked at dead cork cells Coined the term “cell” because of their appearance

Important “Cellular” Scientists Anton van Leeuwenhoek Mastered technique of creating lenses Observed living organisms with improved light microscope

Important “Cellular” Scientists Matthias Schleiden Concludes all plants are made of cells Theodor Schwann Concludes all animals are made of cells Rudolph Virchow Proposes all cells come from pre- existing cells

Cell Theory Schledien, Schwann, and Virchow’s observations laid the foundations for the cell theory. The Cell Theory states: All living things are composed of cells. Cells are the basic units of structure and function in living things. New cells are produced from existing cells.

Important “Cellular” Scientists Janet Plowe Demonstrates the cell membrane is a physical structure Helps develop understanding of cell structures Lynn Margulis Proposes theory of endosymbiosis Helps develop understanding of cell structures

Basic Cell Structures Cell Membrane- Thin, flexible barrier around cell Separates the “outside” from the “inside” Cell Wall- Thick, inflexible barrier around cell Surrounds the Cell Membrane

Basic Cell Structures Cytosol- Liquid material inside cell Organelle- Specialized structure within cell Cytoplasm- Cytosol plus organelles

Basic Cell Structures Nucleus- Internal structure containing cell’s genetic material

Prokaryotic versus Eukaryotic Pro- “Before” Eu- “True” -kary- “Nucleus” Prokaryotic = Before Nucleus Eukaryotic = True Nucleus

ProkaryoticEukaryotic

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