chapter 5.docx

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Published on 17 Apr 2013
School
WLU
Department
Biology
Course
BI110
Professor
The Functions of Membranes
Not just barriers
o
What is a cell membrane?
A permeability barrier that consists of:
o Phospholipids, glycolipids, and membrane proteins
o Sterols (except in bacteria)
Cholesterol (animals)
Ergosterols (fungi)
Phyosterols (plants)
Membrane proteins include:
o Integral proteins (usually transmembrane)
o Peripheral membrane proteins
Fluid Mosaic Model of Cell Membrane
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Membranes are not rigid
Consists of a fluid lipid bilayer in which proteins are
embedded and float freely
Fluid Mosaic Model is Supported by Experimental Evidence:
Membranes are Fluid
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Cell Chemistry Review
Properties of water
o Polarity
o Water as a solvent
What does hydrophilic mean?
o Water loving
What does hydrophobic mean?
o Water fearing
Water Molecules are Polar
Polarity is an uneven distribution of a charge
Electronegative oxygen atom associates hydrogen atoms of
adjacent water molecules to form hydrogen bonds
Hydrogen bonds are also important in DNA and proteins
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