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CELL STRUCTURE AND FXN. Chapter 7 Section 1: LIFE IS CELLULAR (Pgs. 169-173). General Cell Stuff. ~Mid-1600’s: Robert Hooke used an early Microscope to look at cork cells. He call the little chambers he saw “cells” after the rooms monks slept in in monasteries.

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cell structure and fxn

CELL STRUCTURE AND FXN

Chapter 7 Section 1:

LIFE IS CELLULAR

(Pgs. 169-173)

general cell stuff
General Cell Stuff
  • ~Mid-1600’s: Robert Hooke used an early Microscope to look at cork cells.
    • He call the little chambers he saw “cells” after the rooms monks slept in in monasteries.
  • ~Mid-1600’s: Anton van Leeuwenhoek looked at pond water and found living organisms!
  • 1838: Matthias Schleiden said all plants were made of cells.
  • 1839: Theodor Shwann said all animals were made of cells
  • 1855: Rudolph Virchow said all new cells come from existing cells
the cell theory
The Cell Theory
  • The summary of their discoveries constitutes the CELL THEORY!
    • All living things are made of cells
    • Cells are the basic unit of life in living things
    • All new cells are created from preexisting cells
prokaryotes and eukaryotes
Prokaryotes and Eukaryotes
  • All cells can be divided into one of two flavors:
    • Prokaryotes
    • Eukaryotes
  • The defining difference between the two is the presence of a nuclear membrane.
prokaryotes
Prokaryotes
  • In general, Prokaryotic cells are smaller and simpler.
  • Identifying characteristics:
    • Circular Nucleic Acids (genetic material)
    • Nucleic acids are not found in the nucleus
    • No clearly defined internal membranes
    • Single celled organisms
eukaryotes
Eukaryotes
  • In general, eukaryotic cells are more complex and larger.
  • Identifying characteristics:
    • Contain dozens of internal structures
    • Cells are specialized
    • The Genetic material is contained in a nucleus
    • Normally part of multicellular organisms
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