Chapter 3

Chapter 3 - Chapter 3: Cells and Their Functions...

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Chapter 3: Cells and Their Functions Microscope: magnifying instrument needed to examine structures not visible with naked eye Compound light microscope: most commonly used, has two lenses, can magnify up to 1000x Transmission electron microscope (TEM): uses electron beam in place of visible light, can magnify up to 1 million times Scanning electron microscope (SEM): shows only surface features but gives 3D view Micrometer: metric unit Cytology: study of cells Plasma membrane has a double layer of lipid molecules: phospholipid bilayer o Variety of different proteins float in o Channel proteins, transporter proteins, receptor proteins o Sometimes folded into microvilli Nucleus contains chromosomes, inside the nucleus is a nucleolus, which assembles ribosomes Cytoplasm: material that fills cell from nuclear membrane to plasma membrane o Liquid part is cytosol (suspension of nutrients, minerals, enzymes, and other specialized materials in water) Endoplasmic reticulum: smooth ER does synthesis of lipids, and rough ER has ribosomes for protein manufacturing Mitochondria: large organelles round with folded membranes, power plants of the cell (nutrients converted to energy) Golgi apparatus: stack of membranous sacs involved in sorting and modifying
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This note was uploaded on 12/03/2010 for the course HP 350 taught by Professor Lankenau during the Fall '09 term at USC.

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Chapter 3 - Chapter 3: Cells and Their Functions...

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