Biology 2.1 Cell TheoryTHIRD LESSON.notebook

1

Skill Dev. The Discovery of Cells

- magnify objects, making them appear larger than they are

Microscope observations of organisms led to the discovery of cells.

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Why are microscopes used?

Skill Dev. Types of Microscopes

11 Compound Light Microscope

22 Electron Microscope

SEM - Scanning Electron Microscope

TEM - Transmission Electron Microscope

Skill Development ­ Cell

- the smallest unit that can perform all of life's processes

Click the image to watch Tim and Moby discuss the building blocks of life.

Skill Dev. Unicellular Organisms

A unicellular organism is composed of one cell.

All of life‛s activities occur within that single cell.

Skill Dev. Multicellular Organisms

In a multicellular organism, each cell carries on most of the major functions of life.

But so are plants and fungiAnimals are a major

group of multicellularorganisms

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Skill Dev. Cell Theory 1

11

Typical Plant Cellclick here

Typical Animal Cell

All living things are composed of one or more cells.

Biology 2.1 Cell TheoryTHIRD LESSON.notebook

2

Skill Dev. Cell Theory 2

22 Cells are the basic unit of structure of all living things.

33 All presently existing cells arose from previously existing cells.

Skill Dev. Cell Theory 3

and repair of all multicellular organisms.

growth

The ability of cells to divide to form new cells is the basis for all

reproduction

click the star to reveal

Guided Practice ­ Calculating Magnification

Eyepiece Lens Power X

ObjectivePower=Total

Magnification

erase to reveal