Cell Theory
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State the contributions made by Jansen, Hooke, Von Leeuwenhoek, Schleiden, Schwann, and Virchow.

Jansen - Invented compound microscope

Hooke - Examines cork with improved compound microscope

Von Leeuwenhoek - Observes unicellular organisms and nuclei

Schleiden - Says all plants made of cells

Schwann - Proposed cell theory with Schleiden. (All made of identical cells)

Virchow - Omnis cellula e cellula

State three advantages of light microscopes

1.      Specimens can be alive

2.      Faster

3.      Cheaper

4.      Easier to maintain

5.      Smaller

6.     More colourful

State two advantages of electron microscopes

1.      Higher resolution

2.      Greater magnification

Define Organelle

A structure inside a cell that carries out a particular function

Compare the relative sizes of cells, cell membrane thickness, viruses, bacteria, organelles , molecules, using appropriate SI units.

          Molecules                          1        nm

          Membrane thickness            10      nm

          Viruses                             100     nm

          Bacteria                            1        micrometre

          Organelles                         10      micrometres

          Cells                                100     micrometres

n.b. 100 nm = 1 micrometre

Explain the importance of the surface area to volume ratio as a factor limiting cell size

Other Notes in this Category

1. Cell Division - Mitosis
2. Cell Theory
3. Eukaryotic Cell Structure
4. Membranes
5. Prokaryotic Cell Structure

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