25Jan_7 - Biological Science I Tuesdays and Thursdays...

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Biological Science I Tuesdays and Thursdays 8:00-9:15, HCB 102 Mondays 5:15-6:15, KIN 1024 25 January 2011 – Lecture 7 1. Cell Fractionation A. Cell fractionation takes cells apart and separates the major organelles from one another B. Ultracentrifuges fractionate cells into their component parts - (Other methods include chromatography, organic extractions, precipitation) C. Cell fractionation enables scientists to determine the functions of organelles D. Biochemistry and cytology help correlate cell function with structure 2. There are two types of cells: A. The basic structural and functional unit of every organism is one of two types of cells: prokaryotic or eukaryotic A.i. Only organisms of the domains Bacteria and Archaea consist of prokaryotic cells A.ii. Protists, fungi, animals, and plants all consist of eukaryotic cells B. Basic characteristics of all cells (Prokaryotic or Eukaryotic): B.i. Plasma membrane B.i.1. a selective barrier that allows sufficient passage of oxygen, nutrients, and waste to service the volume of every cell B.i.2. The general structure of a biological membrane is a double layer of phospholipids B.ii. Cytosol - semifluid interior substance cytosol B.iii. Chromosomes (carry genes) B.iv. Ribosomes (make proteins) C. Basic characteristics of Prokaryotic cells C.i. No nucleus C.ii. DNA in an unbound region called the nucleoid C.iii. No membrane-bound organelles C.iv. Cytoplasm bound by the plasma membrane D. Basic characteristics of Eukaryotic cells D.i. DNA in a nucleus that is bounded by a membranous nuclear envelope D.ii. Membrane-bound organelles D.iii. Cytoplasm in the region between the plasma membrane and nucleus 3. Cell size A. Eukaryotic cells are generally much larger than prokaryotic cells B.
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This note was uploaded on 11/07/2011 for the course BIO bsc2010 taught by Professor Trombley during the Spring '08 term at FSU.

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25Jan_7 - Biological Science I Tuesdays and Thursdays...

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