THE DISCOVERY OF THE CELL

http://www.ucmp.berkeley.edu/history/hooke.html

In 1685, Robert Hooke used an early microscope to look at a plant material. What was Robert Hooke observing and what was the term that he “coined”?

What was the name of the book that Hooke published?

http://www.aichi-gakuin.ac.jp/~jeffreyb/dental/micro.html

Anton van Leeuwenhoek (1632-1723) made some of the most significant discoveries in the field of biology using microscopes that he had constructed. What are some of the things that van Leeuwenhoek is credited with discovering?

Soon after van Leeuwenhoek, it became clear to scientists that cells were the basic units of life. Between 1838 and 1855, three scientists made important conclusions regarding cells.

http://www.bio.miami.edu/~cmallery/150/unity/cell.text.htm

What were the three conclusions made by Schleiden, Schwann, and Virchow that became known as the CELL THEORY:

1.

2.

3.

As improvements were made to light microscopes, knowledge of the cell and its structures increased. However, with the invention of the electron microscope, understanding of the cell improved significantly.

http://www.unl.edu/CMRAcfem/em.htm

How do electron microscopes work?

Scanning Electron Microscope image of a fruit fly eye

Transmission electron microscope image of a cell

What are the differences between a Scanning Electron Microscope (SEM) and a Transmission Electron Microscope (TEM)?

Use the Virtual Scanning Electron Microscope to observe various specimens:

http://micro.magnet.fsu.edu/primer/java/electronmicroscopy/magnify1/index.html

Prokaryotes vs. Eukaryotes

http://www.slic2.wsu.edu:82/hurlbert/micro101/pages/Chap2.html#Eukaryotic

All cellular life has the following characteristics in common:

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2.

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6.

7.

These characteristics are the MINIMUM characteristics for life. What are the two general cell types that have evolved?

1. 2.

List the main characteristics of each:

Prokaryotes Eukaryotes