Life Is Cellular

Learning Objectives State the cell theory. Describe how the different types of microscopes work. Distinguish between prokaryotes and eukaryotes.

The Discovery of the CellAnton van Leeuwenhoek was the first to observe living microorganisms.

The Cell Theory

• All living things are made up of cells.• Cells are the basic units of structure and function in

living things.

• New cells are produced from existing cells.

Exploring the Cell

Most microscopes use lenses to magnify the image of an object by focusing light or electrons.

Electron Microscopes

Two types of electron microscopes:

•transmission

•scanning

Electron Microscope

Micrographs

A micrograph is a photo of an object seen through a microscope.

Light Microscope Transmission Electron Microscope

Scanning Electron Microscope

Micrographs Review Scanning Electron MicroscopeLight MicroscopeTransmission Electron MicroscopeLight Microscope Using Fluorescent Stain

Cell Size

Certain units of measurement are used fortiny objects, such as cells.

Prokaryotes and Eukaryotes

Nucleus Nucleus

Cell MembraneCell Membrane

Cell MembraneIntracellular

Compartments Intracellular

Compartments

Review• All living things are made up of cells.• Cells are the basic units of structure and function in

living things.• New cells are produced from existing cells.