Ch. 4 - Cell Theory
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Robert Hooke
looked at piece of cork under a microscope and compared what he saw to cellulae (“little rooms”)
Anton van Leeuwenhoek (2)
• looked at and described all sorts of living cells - human blood and sperm, pond water and more
first cell theory
“all living things are composed of living cells”
Rudolph Vichow (2)
• extended cell theory to also include that: “all living cells arise from pre-existing cells” (biogenic law) • prior to this life was thought to generate spontaneously from nonliving matter
Louis Pasteur’s Experiment - Treatment A (3)
• add nutrient broth to flasks with straight necks • sterilize the broth • leave open to air so “life” cam fall into it
Louis Pasteur’s Experiment - Treatment B (3)
• add nutrient broth to flasks with curved necks and cotton • sterilize the broth • leave open to air, but prevent “life” from falling into it, then remove curved piece and cotton and “life” grows
August Fredrich Leopold Weismann (3)
• added important component to the biogenic law: “cells living today trace their ancestry back to ancient times” • there must be a common ancestral cell • further postulated that germ-plasm was hereditary material and only changes to germ cells and not body cells could be inherited
current cell theory (3)
• all living things are made of cells • a cell is the smallest unit in a living thing • all cells come from other cells