Lecture 7 Cell - Lecture 7 Cell Structure A Cell Theory 1 The cell is the basic living unit of all organisms 2 All living things are composed of

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Lecture 7 – Cell Structure A. Cell Theory 1. The cell is the basic living unit of all organisms 2. All living things are composed of cells 3. All cells are derived from preexisting cells B. Fundamental Features 1. Plasma membrane - Function is to be differentially selective 2. Cytoplasm - From the cell membrane to the start of the nucleus - Has ribosomes 3. Nuclear material - Nucleus or nucleoid Contains genetic material C. Cell Size 1. Microscopic - 0.2 m m or smaller (or 200 micrometers) Can’t see with eyes - 0.2 m m or larger = macroscopic - Prokaryotes Range from 1-10 mm - Eukaryotes 10-100 micrometers
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2. Surface area/volume (fig. 4-2) - Surface area = (length x width) x amount of sides mm 2 (3 mm x 3 mm) x 6 sides = 54 mm 2 - Volume = length x width x height mm 3 (3 mm x 3 mm x 3 mm) = 27 mm 3 - SA/V = 54/27 = 2 - The smaller the cell, the larger the surface area/volume ratio 3. Exchange of materials - The volume of a cell increases faster than surface area as cell grows
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This note was uploaded on 05/30/2008 for the course BS 130 taught by Professor Smith during the Fall '07 term at University of the Sciences in Philadelphia.

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Lecture 7 Cell - Lecture 7 Cell Structure A Cell Theory 1 The cell is the basic living unit of all organisms 2 All living things are composed of

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