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In this lesson, we delve into the fascinating world of cells, exploring the main points of the cell theory and how microscopes work. We compare prokaryotic and eukaryotic cells, and learn about the discovery of cells by Anton van Leeuwenhoek. Join us as we explore the structure and function of cells through electron and light microscopy.
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Learning Objectives • Explain the main points of the cell theory. • Explain how microscopes work. • Compare prokaryotic and eukaryotic cells.
The Discovery of the Cell Anton 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
Micrographs A micrograph is a photo of an object seen through a microscope. Scanning Electron Microscope Transmission Electron Microscope Light Microscope
Cell Size Certain units of measurement are used for tiny objects, such as cells.
Prokaryotes and Eukaryotes Nucleus Nucleus Cell Membrane Cell Membrane Cell Membrane
