Chapter 04 Cells

Chapter 04 Cells - Cell Structure and Function Cells...

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Unformatted text preview: Cell Structure and Function Cells History • Robert Hooke saw cork under a microscope and though the cellulose looked like little rooms so he called them, “Cells” • Van Leeuwenhoek- observed bacteria and sperm called animalcules • Rober Brown- discovered the nucleus (not the same as in chemistry) Cell Theory (3 parts) • 1. Every organism is composed of cells • 2. The cell is the smallest unit of life • 3. Life comes only from cells Spontaneous Generation • Ancient untrue theory that: Life comes from non- living matter • According to this bogus theory, Life comes from the “Either” • Argument for: Meat that rots spawns maggots • Argument against: the Pasteur Flask • The cell theory states that: Cells only arise by the division of a previously existing cell. • LIFE COMES ONLY FROM LIFE! Cell Structure Components of the Cell • A plasma membrane surrounds the cell • Small parts of the inside of the cell are called ORGANELLES (little organs) • Two major kinds of cells: – PROKARYOTIC- (Pro = before, Karyon = nut) Bacteria, no membranes around it’s organelles, just cell soup – EUKARYOTIC- (Eu = true, karyon = nut) Animals (Us) and plants, these...
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Chapter 04 Cells - Cell Structure and Function Cells...

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