Chapter 5

Chapter 5 - Cell Structure and Function Chapter 5 Early...

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Cell Structure and Function Chapter 5
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Mid 1600s – Robert Hooke observed and described cork cells Late 1600s – Antony van Leeuwenhoek observed sperm, microorganisms 1820s - Robert brown observed and named nucleus in plant cells Early Discoveries
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Cell Theory (several individuals contributed) 1) Every organism is composed of one or more cells 2) Cell is smallest unit having properties of life 3) Continuity of life arises from growth and division of single cells
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Smallest unit of life Can survive on it’s own or has potential to do so Highly organized for metabolism Senses and responds to environment Has potential to reproduce Cell
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Structure of Cells All start out life with: Plasma membrane Region where DNA is stored Cytoplasm Two types prokaryotic eukaryotic
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Main component of cell membranes Gives the membrane it’s fluid properties Two layers of phospholipids Lipid Bilayer one layer of lipids one layer of lipids
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Membrane Proteins Recognition protein Receptor protein Protein pump Protein channel across bilayer Protein pump across bilayer Lipid bilayer Cytoplasm
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Why Are Cells So Small? Surface-to-volume ratio The bigger a cell is, the less surface area there is per unit of volume Above a certain size, material cannot be moved in or out of cell fast enough
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0.5 1.0 1.5 0.79 0.06 3.14 7.07 0.52 1.77 Diameter (cm): Surface area (cm 2 ): Volume (cm 3 ): Surface- to-volume ratio: 13.17:1 6.04:1 3.99:1
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This note was uploaded on 04/09/2008 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Chapter 5 - Cell Structure and Function Chapter 5 Early...

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