Life 102 Ch 6.docx

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Colorado State University
Life Science
LIFE 102

Chapter 6 • All organisms are made of cells and are packages • What kind of lipids make up cell membranes? An example pictured on the right? Phospholipids • Which of the following proteins perform in accelerating the chemical reactions that occur inside of all life? Enzymatic proteins • The cell is the simplest collection of matter that can live. • Cells are surrounded by membranes made of phospholipids “fabric” interwoven with cholesterol and protein. • Scanning electron microscopes focus a beam of electrons onto the surface of a specimen ~providing images that look 3d • Transmission electron microscopes focus a beam of electrons through a specimen ~ TEMS are used mainly to study the internal structure of cells • Cell fractionation: Takes cells apart and separates the major organelles from one another • Ultracentrifuges fractionate cells into their component of cells • Cell fractionation enables scientists to determine the functions of organelles • Biochemistry and cytology help correlate cell function with structure. 6.2 • Plasma membrane ~ the baggie containing everything else • Semi fluid substance called cytosol ~ goopy stuff • Chromosomes (carry genes) ~the library • Ribosomes (make proteins) ~the factory • Eukaryotic cells are characterized by having 1. DNA in a nucleus that is bounded by a membranous nuclear envelope. 2. Membrane bound organelles
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