Life is cellular 7.1.

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Presentation transcript:

Life is cellular 7.1

Key Questions What is the cell theory? How do microscopes work? How are prokaryotic and eukaryotic cells different?

The Cell Theory All living organisms are made up of one or more cells. Cells are the basic unit of structure and function in all living organisms. Cells arise only from previously existing cells.

Microscope is the main tool Light microscope used in classroom. Can view living subjects, but magnification only goes to 1000X (400X). Electron microscope uses electrons to create image. Can magnify to 500,000X

Compound light microscope

Electron microscope images

What cells have in common All cells have a plasma membrane, ribosomes, and genetic material. Cells break down molecules for energy (metabolism).

Differences in cells Cells differ in their function (what they can do). Cells are grouped along 2 distinguishing differences – prokaryotic and eukaryotic.

Prokaryotic vs eukaryotic cells Prokaryotic – cells without a nucleus or membrane bound organelles. Example is bacteria, archea Eukaryotic – cells that contain a nucelus and other membrane bound organelles. Examples are plants, animals, protists, and fungi.

What came first? Why are there 2 cell types and which one came first? Endosymbiont theory http://www.sumanasinc.com/webcontent/animations/content/organelles.html What 2 organelles are associated with this theory?