Chapter 2.3 Discovering Cells.

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Presentation transcript:

Chapter 2.3 Discovering Cells

POINT > Identify how cells were discovered POINT > Describe how different microscopes work POINT > Describe the development of Cell Theory

POINT > Identify how cells were discovered The invention of the lens Robert Hooke (1665): observed a thin slice of cork (dead plant cells) with a microscope He described what he observed as “little boxes” (cells)

POINT > Identify how cells were discovered Anton van Leeuwenhoek (1675): was the first person to observe living cells He was looking at pond water and saw “miniature animals” swimming around

CHECK: Who was the first person to see cells? What was Robert Hooke looking at with his microscope? What was van Leeuwenhoek looking at when he first saw living cells?

POINT > Describe how different microscopes work Magnification refers to the microscope’s power to increase an object’s apparent size

POINT > Describe how different microscopes work Resolution refers to the microscope’s power to show detail clearly

POINT > Describe different microscopes The compound microscope uses two lenses to magnify objects

CHECK: What is magnification? What is resolution? How many lenses in a compound microscope?

POINT > Describe different microscopes Elodea (aquatic plant) with a light microscope 40X 400X

Transmission Electron Microscope (TEM)

Transmission Electron Microscope (TEM) gives better resolution Herpes Virus Plant Root Cell

Scanning Electron Microscope (SEM)

Scanning Electron Microscope (SEM) shows even better topography Mosquito Head 200X 2000X

Scanning Electron Microscope (SEM) Fly Eye

Scanning Electron Microscope (SEM) Inside of Stomach Surface of Tongue Neuron

Scanning Electron Microscope (SEM) Pollen Yeast Red Blood Cell, Platelet, and White Blood Cell

TEM vs. SEM Viruses leaving a cell

POINT > Describe the development of Cell Theory Who developed the Cell Theory? Matthias Schleiden (1838): concluded that all plants are composed of cells Theodor Schwann (1839): concluded that all animals are composed of cells Rudolph Virchow (1855): determined that cells come only from other cells

POINT > Describe the development of Cell Theory What is the Cell Theory? 1. All living things are composed of one or more cells 2. Cells are the basic units of life function 3. Cells come only from existing cells

Homework: Read pages 50-57 Finish Study Guide GRAS pages 31-33

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