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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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