Unit 2 Cell Structure and Function Section 7

Unit 2 Cell Structure and Function Section 7. 1 Cell Theory

� 1) What is a cell? � 2) What does the nucleus do? � 3) What is a eukaryote and prokaryote?

Discovery of the Cell � 1665: Robert Hooke identified dead plant cells, and named the “cell” � 1673: A. Leeuwenhoek is the 1 st person to observe living cells

• Matthais Schleiden (Plants) Theodor Schwann (Animals) Germany 1839: all organisms made of

• Rudolf Virchow (Germany 1858): all cells come from cells.

The Cell Theory All living things are composed of one or more cells 2) Cells are the basic unit of structure and function in organisms 3) All cells come from the reproduction for pre-existing cells 1)

Cell Diversity �Internal Organization: ◦ Organelle: cell components that performs ______ for the cell �Will maintain life for the cell ◦ Cell is surrounded by a ______ �Each organelle has its own membrane ◦ Nucleus:

Cell Diversity �Eukaryotes: organisms that contain a membrane-bound nucleus and organelles ◦ Animal cells and plant cells �Prokaryotes: unicellular organisms that lack membrane-bound nucleus and organelles ◦ bacteria

Compare and Contrast the Eukaryotic and Prokaryotic Cell membrane Cytoplasm Nucleus Eukaryotic Cell Organelles

Eukaryote and Prokaryote

Prokaryotic Eukaryotic 1. No nucleus 2. Simpler structure 3. Smaller 4. Reproduce: Binary Fission 5. Bacteria 1. Nucleus 2. Complex 3. Larger 4. Reproduce: Mitosis 5. Animal and Plants

BACTERIA MAGNIFIED Bacteria on the tip of a pin