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7-1 Life is CELLULAR

7-1 Life is CELLULAR. Federoff. Key Questions. What is the cell theory? How do microscopes work? How are prokaryotic and eukaryotic cells different?. Discovery of the Cell. Microscopes allowed a new world to open up. Started in the late 1500’s with eyeglass makers Robert Hooke (1665)

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7-1 Life is CELLULAR

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  1. 7-1 Life is CELLULAR Federoff

  2. Key Questions • What is the cell theory? • How do microscopes work? • How are prokaryotic and eukaryotic cells different?

  3. Discovery of the Cell • Microscopes allowed a new world to open up. • Started in the late 1500’s with eyeglass makers • Robert Hooke (1665) • Englishman • Studied Cork • Termed cells “cells” because of their resemblance to monastery rooms.

  4. Discovery of the Cell (cont.) • Anton van Leewenhoek • Same time as Hooke • Documented first LIVING and moving cells we know today as microorganisms

  5. Cell Theory • Schleiden, Schwann and Virchow – Scientists contributors • States that: • All living things are made of cells • Cells are the basic structure and function in all living things • New cells come from existing cells

  6. Exploring the cell - Microscopes • Light Microscopes • Have an objective and eyepiece (ocular) lens • Compound magnification • LIMITS • Detail • 1000x magnification • Requires a stain • Thin specimen for light to pass through

  7. Microscopes (cont.) • Electron Microscopes • Higher Resolution • Can view DNA and Viruses • Scanning and Transmission • LIMITS • Must chemically preserve • Needs to be DEAD • Need to add false color

  8. Scanning

  9. Transmission

  10. Cell Types • Lots of variety in size, shape and function • All contain DNA and a cell membrane • 2 Types • Eukaryotes – have DNA in a nucleus • Prokaryotes – Do not have a nucleus to contain their DNA

  11. Prokaryotes • Smaller • Simpler • Doesn’t separate DNA with a nucleus • Unicellular • Ex. Bacteria

  12. Eukaryotes • Larger • More complex • DNA in nucleus • Great variety • Unicellular or Multicellular • Ex. Your cells

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